In BASH, How do i replace \r from a variable that exist in a file written using HTML

Question

How do i replace the \r?

#!/bin/bash
...

# setup
if [[ $i =~ $screen ]]; then

    ORIGINAL=${BASH_REMATCH[1]}          # original value is: 3DROTATE\r
    AFTER   =${ORIGINAL/\\r/}            # does not replace \r
    myThirdPartyApplication -o $replvar  # FAILS because of \r

fi

can't have spaces around the `=` – glenn jackman Oct 18 '11 at 12:40 — glenn jackman, Oct 18 '11 at 12:40

score 25 · Answer 1 · answered Apr 25 '13 at 07:43

25

This should remove the first \r.

AFTER="${ORIGINAL/$'\r'/}"

If you need to remove all of them use ${ORIGINAL//$'\r'/}

answered Apr 25 '13 at 07:43

tharrrk

361
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1

IMHO this is the best answer, as it avoids the overhead of launching an external program (such as sed or tr). The $ at the beginning of $'\r' is essential to have the \r converted to a 'carriage return' character in the pattern of things to be replaced. Maybe it's not obvious, the \r is replaced with nothing (the absence of characters between the last / and }. – Tim Bird Jan 11 '17 at 01:52
this maybe a top voted answer and works for me too. but there is a problem reported by shellcheck: https://github.com/koalaman/shellcheck/wiki/SC3060 – Mohammad Faisal Dec 13 '21 at 17:37

imm · Accepted Answer · 2018-10-13T18:07:05.840

11

You could use sed, i.e.,

AFTER=`echo $ORIGINAL | sed 's/\\r//g'`

edited Oct 13 '18 at 18:07

answered Oct 17 '11 at 22:48

imm

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It drops $' in the beginning also. Cool. – Josef Klimuk Apr 23 '18 at 09:02
2

Worked!!! Just a little improve: spaces are not allowed in value assignation : AFTER=echo... – JRichardsz Sep 25 '18 at 14:30

score 5 · Answer 3 · answered Jun 10 '13 at 13:16

5

Another option is to use 'tr' to delete the character, or replace it with \n or anything else.

 ORIGINAL=$(echo ${BASH_REMATCH[1]} | tr -d '\r')

answered Jun 10 '13 at 13:16

3molo

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score 3 · Answer 4 · answered Oct 08 '13 at 00:51

3

Similar to @tharrrk's approach, this parameter substitution also remove the last '\r':

AFTER="${ORIGINAL%'\r'}"

answered Oct 08 '13 at 00:51

user2510797

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score 3 · Answer 5 · answered Oct 17 '11 at 22:48

3

Just use a literal ^M character, it has no meaning to bash.

answered Oct 17 '11 at 22:48

Neil

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In BASH, How do i replace \r from a variable that exist in a file written using HTML

5 Answers5