Using awk to print all columns from the nth to the last

Question

This line worked until I had whitespace in the second field:

svn status | grep '\!' | gawk '{print $2;}' > removedProjs

Is there a way to have awk print everything in $2 or greater? ($3, $4.. until we don't have any more columns?)

I'm doing this in a Windows environment with Cygwin.

Answer 1

Print all columns:

awk '{print $0}' somefile

Print all but the first column:

awk '{$1=""; print $0}' somefile

Print all but the first two columns:

awk '{$1=$2=""; print $0}' somefile

Answer 2

There's a duplicate question with a simpler answer using cut:

 svn status |  grep '\!' | cut -d\  -f2-

-d specifies the delimeter (space), -f specifies the list of columns (all starting with the 2nd)

Answer 3

You could use a for-loop to loop through printing fields $2 through $NF (built-in variable that represents the number of fields on the line).

Edit: Since "print" appends a newline, you'll want to buffer the results:

awk '{out = ""; for (i = 2; i <= NF; i++) {out = out " " $i}; print out}'

Alternatively, use printf:

awk '{for (i = 2; i <= NF; i++) {printf "%s ", $i}; printf "\n"}'

Answer 4

awk '{out=$2; for(i=3;i<=NF;i++){out=out" "$i}; print out}'

My answer is based on the one of VeeArr, but I noticed it started with a white space before it would print the second column (and the rest). As I only have 1 reputation point, I can't comment on it, so here it goes as a new answer:

start with "out" as the second column and then add all the other columns (if they exist). This goes well as long as there is a second column.

Answer 5

Most solutions with awk leave an space. The options here avoid that problem.

Option 1

A simple cut solution (works only with single delimiters):

command | cut -d' ' -f3-

Option 2

Forcing an awk re-calc sometimes remove the added leading space (OFS) left by removing the first fields (works with some versions of awk):

command | awk '{ $1=$2="";$0=$0;} NF=NF'

Option 3

Printing each field formatted with printf will give more control:

$ in='    1    2  3     4   5   6 7     8  '
$ echo "$in"|awk -v n=2 '{ for(i=n+1;i<=NF;i++) printf("%s%s",$i,i==NF?RS:OFS);}'
3 4 5 6 7 8

However, all previous answers change all repeated FS between fields to OFS. Let's build a couple of option that do not do that.

Option 4 (recommended)

A loop with sub to remove fields and delimiters at the front.
And using the value of FS instead of space (which could be changed).
Is more portable, and doesn't trigger a change of FS to OFS: NOTE: The ^[FS]* is to accept an input with leading spaces.

$ in='    1    2  3     4   5   6 7     8  '
$ echo "$in" | awk '{ n=2; a="^["FS"]*[^"FS"]+["FS"]+";
  for(i=1;i<=n;i++) sub( a , "" , $0 ) } 1 '
3     4   5   6 7     8

Option 5

It is quite possible to build a solution that does not add extra (leading or trailing) whitespace, and preserve existing whitespace(s) using the function gensub from GNU awk, as this:

$ echo '    1    2  3     4   5   6 7     8  ' |
  awk -v n=2 'BEGIN{ a="^["FS"]*"; b="([^"FS"]+["FS"]+)"; c="{"n"}"; }
          { print(gensub(a""b""c,"",1)); }'
3     4   5   6 7     8 

It also may be used to swap a group of fields given a count n:

$ echo '    1    2  3     4   5   6 7     8  ' |
  awk -v n=2 'BEGIN{ a="^["FS"]*"; b="([^"FS"]+["FS"]+)"; c="{"n"}"; }
          {
            d=gensub(a""b""c,"",1);
            e=gensub("^(.*)"d,"\\1",1,$0);
            print("|"d"|","!"e"!");
          }'
|3     4   5   6 7     8  | !    1    2  !

Of course, in such case, the OFS is used to separate both parts of the line, and the trailing white space of the fields is still printed.

NOTE: [FS]* is used to allow leading spaces in the input line.

Answer 6

I personally tried all the answers mentioned above, but most of them were a bit complex or just not right. The easiest way to do it from my point of view is:

awk -F" " '{ for (i=4; i<=NF; i++) print $i }'

1. Where -F" " defines the delimiter for awk to use. In my case is the whitespace, which is also the default delimiter for awk. This means that -F" " can be ignored.

2. Where NF defines the total number of fields/columns. Therefore the loop will begin from the 4th field up to the last field/column.

3. Where $N retrieves the value of the Nth field. Therefore print $i will print the current field/column based based on the loop count.

Answer 7

awk '{ for(i=3; i<=NF; ++i) printf $i""FS; print "" }'

lauhub proposed this correct, simple and fast solution here

Answer 8

This was irritating me so much, I sat down and wrote a cut-like field specification parser, tested with GNU Awk 3.1.7.

First, create a new Awk library script called pfcut, with e.g.

sudo nano /usr/share/awk/pfcut

Then, paste in the script below, and save. After that, this is how the usage looks like:

$ echo "t1 t2 t3 t4 t5 t6 t7" | awk -f pfcut --source '/^/ { pfcut("-4"); }'
t1 t2 t3 t4

$ echo "t1 t2 t3 t4 t5 t6 t7" | awk -f pfcut --source '/^/ { pfcut("2-"); }'
t2 t3 t4 t5 t6 t7

$ echo "t1 t2 t3 t4 t5 t6 t7" | awk -f pfcut --source '/^/ { pfcut("-2,4,6-"); }'
t1 t2 t4 t6 t7

To avoid typing all that, I guess the best one can do (see otherwise Automatically load a user function at startup with awk? - Unix & Linux Stack Exchange) is add an alias to ~/.bashrc; e.g. with:

$ echo "alias awk-pfcut='awk -f pfcut --source'" >> ~/.bashrc
$ source ~/.bashrc     # refresh bash aliases

... then you can just call:

$ echo "t1 t2 t3 t4 t5 t6 t7" | awk-pfcut '/^/ { pfcut("-2,4,6-"); }'
t1 t2 t4 t6 t7

Here is the source of the pfcut script:

# pfcut - print fields like cut
#
# sdaau, GNU GPL
# Nov, 2013

function spfcut(formatstring)
{
  # parse format string
  numsplitscomma = split(formatstring, fsa, ",");
  numspecparts = 0;
  split("", parts); # clear/initialize array (for e.g. `tail` piping into `awk`)
  for(i=1;i<=numsplitscomma;i++) {
    commapart=fsa[i];
    numsplitsminus = split(fsa[i], cpa, "-");
    # assume here a range is always just two parts: "a-b"
    # also assume user has already sorted the ranges
    #print numsplitsminus, cpa[1], cpa[2]; # debug
    if(numsplitsminus==2) {
     if ((cpa[1]) == "") cpa[1] = 1;
     if ((cpa[2]) == "") cpa[2] = NF;
     for(j=cpa[1];j<=cpa[2];j++) {
       parts[numspecparts++] = j;
     }
    } else parts[numspecparts++] = commapart;
  }
  n=asort(parts); outs="";
  for(i=1;i<=n;i++) {
    outs = outs sprintf("%s%s", $parts[i], (i==n)?"":OFS); 
    #print(i, parts[i]); # debug
  }
  return outs;
}

function pfcut(formatstring) {
  print spfcut(formatstring);
}

Answer 9

Would this work?

awk '{print substr($0,length($1)+1);}' < file

It leaves some whitespace in front though.

Answer 10

Printing out columns starting from #2 (the output will have no trailing space in the beginning):

ls -l | awk '{sub(/[^ ]+ /, ""); print $0}'

Answer 11

echo "1 2 3 4 5 6" | awk '{ $NF = ""; print $0}'

this one uses awk to print all except the last field

Answer 12

This is what I preferred from all the recommendations:

Printing from the 6th to last column.

ls -lthr | awk '{out=$6; for(i=7;i<=NF;i++){out=out" "$i}; print out}'

or

ls -lthr | awk '{ORS=" "; for(i=6;i<=NF;i++) print $i;print "\n"}'

Answer 13

If you need specific columns printed with arbitrary delimeter:

awk '{print $3 "  " $4}'

col#3 col#4

awk '{print $3 "anything" $4}'

col#3anythingcol#4

So if you have whitespace in a column it will be two columns, but you can connect it with any delimiter or without it.

Answer 14

Perl solution:

perl -lane 'splice @F,0,1; print join " ",@F' file

These command-line options are used:

• -n loop around every line of the input file, do not automatically print every line

• -l removes newlines before processing, and adds them back in afterwards

• -a autosplit mode – split input lines into the @F array. Defaults to splitting on whitespace

• -e execute the perl code

splice @F,0,1 cleanly removes column 0 from the @F array

join " ",@F joins the elements of the @F array, using a space in-between each element

---

Python solution:

python -c "import sys;[sys.stdout.write(' '.join(line.split()[1:]) + '\n') for line in sys.stdin]" < file

Answer 15

I want to extend the proposed answers to the situation where fields are delimited by possibly several whitespaces –the reason why the OP is not using cut I suppose.

I know the OP asked about awk, but a sed approach would work here (example with printing columns from the 5th to the last):

• pure sed approach

    sed -r 's/^\s*(\S+\s+){4}//' somefile
  

  Explanation:

  • s/// is the standard command to perform substitution
  • ^\s* matches any consecutive whitespace at the beginning of the line
  • \S+\s+ means a column of data (non-whitespace chars followed by whitespace chars)
  • (){4} means the pattern is repeated 4 times.

• sed and cut

    sed -r 's/^\s+//; s/\s+/\t/g' somefile | cut -f5-
  

  by just replacing consecutive whitespaces by a single tab;

• tr and cut: tr can also be used to squeeze consecutive characters with the -s option.

    tr -s [:blank:] <somefile | cut -d' ' -f5-
  

Answer 16

If you don't want to reformat the part of the line that you don't chop off, the best solution I can think of is written in my answer in:

How to print all the columns after a particular number using awk?

It chops what is before the given field number N, and prints all the rest of the line, including field number N and maintaining the original spacing (it does not reformat). It doesn't mater if the string of the field appears also somewhere else in the line.

Define a function:

fromField () { 
awk -v m="\x01" -v N="$1" '{$N=m$N; print substr($0,index($0,m)+1)}'
}

And use it like this:

$ echo "  bat   bi       iru   lau bost   " | fromField 3
iru   lau bost   
$ echo "  bat   bi       iru   lau bost   " | fromField 2
bi       iru   lau bost 

Output maintains everything, including trailing spaces

In you particular case:

svn status | grep '\!' | fromField 2 > removedProjs

If your file/stream does not contain new-line characters in the middle of the lines (you could be using a different Record Separator), you can use:

awk -v m="\x0a" -v N="3" '{$N=m$N ;print substr($0, index($0,m)+1)}'

The first case will fail only in files/streams that contain the rare hexadecimal char number 1

Answer 17

This awk function returns substring of $0 that includes fields from begin to end:

function fields(begin, end,    b, e, p, i) {
    b = 0; e = 0; p = 0;
    for (i = 1; i <= NF; ++i) {
        if (begin == i) { b = p; }
        p += length($i);
        e = p;
        if (end == i) { break; }
        p += length(FS);
    }
    return substr($0, b + 1, e - b);
}

To get everything starting from field 3:

tail = fields(3);

To get section of $0 that covers fields 3 to 5:

middle = fields(3, 5);

b, e, p, i nonsense in function parameter list is just an awk way of declaring local variables.

Answer 18

All of the other answers given here and in linked questions fail in various ways given various possible FS values. Some leave leading and/or trailing white space, some convert every FS to the OFS, some rely on semantics that only apply when FS is the default value, some rely on negating FS in a bracket expression which will fail given a multi-char FS, etc.

To do this robustly for any FS, use GNU awk for the 4th arg to split():

$ cat tst.awk
{
    split($0,flds,FS,seps)
    for ( i=n; i<=NF; i++ ) {
        printf "%s%s", flds[i], seps[i]
    }
    print ""
}

$ printf 'a   b c    d\n' | awk -v n=3 -f tst.awk
c    d

$ printf ' a   b c    d\n' | awk -v n=3 -f tst.awk
c    d

$ printf ' a   b c    d\n' | awk -v n=3 -F'[ ]' -f tst.awk
  b c    d

$ printf ' a   b c    d\n' | awk -v n=3 -F'[ ]+' -f tst.awk
b c    d

$ printf 'a###b###c###d\n' | awk -v n=3 -F'###' -f tst.awk
c###d

$ printf '###a###b###c###d\n' | awk -v n=3 -F'###' -f tst.awk
b###c###d

Note that I'm using split() above because it's 3rg arg is a field separator, not just a regexp like the 2nd arg to match(). The difference is that field separators have additional semantics to regexps such as skipping leading and/or trailing blanks when the separator is a single blank char - if you wanted to use a while(match()) loop or any form of *sub() to emulate the above then you'd need to write code to implement those semantics whereas split() already implements them for you.

Answer 19

Perl:

@m=`ls -ltr dir | grep ^d | awk '{print \$6,\$7,\$8,\$9}'`;
foreach $i (@m)
{
        print "$i\n";

}

Answer 20

This would work if you are using Bash and you could use as many 'x ' as elements you wish to discard and it ignores multiple spaces if they are not escaped.

while read x b; do echo "$b"; done < filename

Answer 21

Awk examples looks complex here, here is simple Bash shell syntax:

command | while read -a cols; do echo ${cols[@]:1}; done

Where 1 is your nth column counting from 0.

---

Example

Given this content of file (in.txt):

c1
c1 c2
c1 c2 c3
c1 c2 c3 c4
c1 c2 c3 c4 c5

here is the output:

$ while read -a cols; do echo ${cols[@]:1}; done < in.txt 

c2
c2 c3
c2 c3 c4
c2 c3 c4 c5

Answer 22

UPDATE :

if you wanna use no function calls at all while preserving the spaces and tabs in between the remaining fields, then do :

echo  "    1   2  33  4444 555555 \t6666666    " | 

{m,g}awk ++NF FS='^[ \t]*[^ \t]*[ \t]+|[ \t]+$' OFS= 

=

2  33  4444 555555     6666666

===================

You can make it a lot more straight forward :

 svn status | [m/g]awk   '/!/*sub("^[^ \t]*[ \t]+",_)'

 svn status |   [n]awk '(/!/)*sub("^[^ \t]*[ \t]+",_)'

Automatically takes care of the grep earlier in the pipe, as well as trimming out extra FS after blanking out $1, with the added bonus of leaving rest of the original input untouched instead of having tabs overwritten with spaces (unless that's the desired effect)

If you're very certain $1 does not contain special characters that need regex escaping, then it's even easier :

mawk         '/!/*sub($!_"[ \t]+",_)'
gawk -c/P/e '/!/*sub($!_"""[ \t]+",_)' 

Or if you prefer customizing FS+OFS to handle it all :

mawk 'NF*=/!/' FS='^[^ \t]*[ \t]+' OFS='' # this version uses OFS

Answer 23

This should be a reasonably comprehensive awk-field-sub-string-extraction function that

• returns substring of $0 based on input ranges, inclusive
• clamp in out of range values,
• handle variable length field SEPs
• has speedup treatments for ::

• completely no inputs, returning $0 directly
• input values resulting in guaranteed empty string ("")
• FROM-field == 1
• FS = "" that has split $0 out by individual chars (so the FROM <(_)> and TO <(__)> fields behave like cut -c rather than cut -f)

• original $0 restored, w/o overwriting FS seps with OFS

|

 {m,g}awk '{
 2         print "\n|---BEFORE-------------------------\n"
 3         ($0) "\n|----------------------------\n\n  ["
 4         fld2(2, 5) "]\n  [" fld2(3) "]\n  [" fld2(4, 2)
 5         "]<----------------------------------------------should be
 6         empty\n  [" fld2(3, 11) "]<------------------------should be
 7         capped by NF\n  [" fld2() "]\n  [" fld2((OFS=FS="")*($0=$0)+11,
 8         23) "]<-------------------FS=\"\", split by chars
 9         \n\n|---AFTER-------------------------\n" ($0)
10         "\n|----------------------------"
11  }


12  function fld2(_,__,___,____,_____)
13  {
           if (+__==(_=-_<+_ ?+_:_<_) || (___=____="")==__ || !NF) {
              return $_
16         } else if (NF<_ || (__=NF<+__?NF:+__)<(_=+_?_:!_)) {
              return ___
18         } else if (___==FS || _==!___) {
19            return ___<FS \
                 ? substr("",$!_=$!_ substr("",__=$!(NF=__)))__
20               : substr($(_<_),_,__)
21         }
22         _____=$+(____=___="\37\36\35\32\31\30\27\26\25"\
                              "\24\23\21\20\17\16\6\5\4\3\2\1")
23         NF=__
24         if ($(!_)~("["(___)"]")) {
25            gsub("..","\\&&",___) + gsub(".",___,____)
27            ___=____
28         }
29         __=(_) substr("",_+=_^=_<_)

30         while(___!="") {
31            if ($(!_)!~(____=substr(___,--_,++_))) {
32               ___=____
33            break }
35            ___=substr(___,_+_^(!_))
36         }
37         return \
           substr("",($__=___ $__)==(__=substr($!_,
              _+index($!_,___))),_*($!_=_____))(__)
    }'

those <TAB> are actual \t \011 but relabeled for display clarity

|---BEFORE------------------------- 
       1   2  33  4444 555555 <TAB>6666666    
|----------------------------

  [2 33 4444 555555]
  [33]
  []<---------------------------------------------- should be empty
  [33 4444 555555 6666666]<------------------------ should be capped by NF
  [       1   2  33  4444 555555 <TAB>6666666    ]
  [ 2  33  4444 555555 <TAB>66]<------------------- FS="", split by chars 

|---AFTER------------------------- 
       1   2  33  4444 555555 <TAB>6666666    
|----------------------------

Answer 24

__='    1    2  3     4   5   6 7     8  '

---

printf '%s' "$__" | od

0000000         538976288       538976305       538980896       538976307
                           1                   2           3            
          040 040 040 040 061 040 040 040 040 062 040 040 063 040 040 040
          sp  sp  sp  sp   1  sp  sp  sp  sp   2  sp  sp   3  sp  sp  sp
           32  32  32  32  49  32  32  32  32  50  32  32  51  32  32  32
           20  20  20  20  31  20  20  20  20  32  20  20  33  20  20  20

0000020         540287008       540352544       540418080       538976311
                   4               5               6       7            
          040 040 064 040 040 040 065 040 040 040 066 040 067 040 040 040
          sp  sp   4  sp  sp  sp   5  sp  sp  sp   6  sp   7  sp  sp  sp
           32  32  52  32  32  32  53  32  32  32  54  32  55  32  32  32
           20  20  34  20  20  20  35  20  20  20  36  20  37  20  20  20

0000040         540549152              32                                
                   8                                                    
          040 040 070 040 040                                            
          sp  sp   8  sp  sp                                            
           32  32  56  32  32                                            
           20  20  38  20  20                                            

printf '\42%s\42' "$__"

" 1 2 3 4 5 6 7 8 "

---

mawk ++NF FS='^[ \t]*[^ \t]+[ \t]+' OFS='"'

"2 3 4 5 6 7 8 "

This approach preserves all multi-blank seps between fields by specifically targeting just the head.

Answer 25

ls -la | awk '{o=$1" "$3; for (i=5; i<=NF; i++) o=o" "$i; print o }'

from this answer is not bad but the natural spacing is gone.
Please then compare it to this one:

ls -la | cut -d\  -f4-

Then you'd see the difference.

Even ls -la | awk '{$1=$2=""; print}' which is based on the answer voted best thus far is not preserve the formatting.

Thus I would use the following, and it also allows explicit selective columns in the beginning:

ls -la | cut -d\  -f1,4-

Note that every space counts for columns too, so for instance in the below, columns 1 and 3 are empty, 2 is INFO and 4 is:

$ echo " INFO  2014-10-11 10:16:19  main " | cut -d\  -f1,3

$ echo " INFO  2014-10-11 10:16:19  main " | cut -d\  -f2,4
INFO 2014-10-11
$

Answer 26

If you want formatted text, chain your commands with echo and use $0 to print the last field.

Example:

for i in {8..11}; do
   s1="$i"
   s2="str$i"
   s3="str with spaces $i"
   echo -n "$s1 $s2" | awk '{printf "|%3d|%6s",$1,$2}'
   echo -en "$s3" | awk '{printf "|%-19s|\n", $0}'
done

Prints:

|  8|  str8|str with spaces 8  |
|  9|  str9|str with spaces 9  |
| 10| str10|str with spaces 10 |
| 11| str11|str with spaces 11 |

Answer 27

I wasn't happy with any of the awk solutions presented here because I wanted to extract the first few columns and then print the rest, so I turned to perl instead. The following code extracts the first two columns, and displays the rest as is:

echo -e "a  b  c  d\te\t\tf g" | \
  perl -ne 'my @f = split /\s+/, $_, 3; printf "first: %s second: %s rest: %s", @f;'

The advantage compared to the perl solution from Chris Koknat is that really only the first n elements are split off from the input string; the rest of the string isn't split at all and therefor stays completely intact. My example demonstrates this with a mix of spaces and tabs.

To change the amount of columns that should be extracted, replace the 3 in the example with n+1.

Answer 28

The top-voted answer by zed_0xff did not work for me.

I have a log where after $5 with an IP address can be more text or no text. I need everything from the IP address to the end of the line should there be anything after $5. In my case, this is actually within an awk program, not an awk one-liner so awk must solve the problem. When I try to remove the first 4 fields using the solution proposed by zed_0xff:

echo "  7 27.10.16. Thu 11:57:18 37.244.182.218" | awk '{$1=$2=$3=$4=""; printf "[%s]\n", $0}'

it spits out wrong and useless response (I added [..] to demonstrate):

[    37.244.182.218 one two three]

There are even some suggestions to combine substr with this wrong answer, but that only complicates things. It offers no improvement.

Instead, if columns are fixed width until the cut point and awk is needed, the correct answer is:

echo "  7 27.10.16. Thu 11:57:18 37.244.182.218" | awk '{printf "[%s]\n", substr($0,28)}'

which produces the desired output:

[37.244.182.218 one two three]