How to refer to string content when using ls

Question

I'm working with IRAF, based on SPP, kind of a mix between Fortran and C. I'm looking for a way of referring to a string content when using ls. For example, I can type ls *hola* if I want to list every file containing the word hola in my directory. Supose I have an string called id whose content is the world hola. How could I refer to the content in id? I'm looking for some sort of ls id (I know that construction won't work) which returns the same result as in ls *hola*.

Thank you in advance.

EDIT: SPP is somehow hidden on the Internet but here you have a reference manual https://www.mn.uio.no/astro/english/services/it/help/visualization/iraf/SPPManual.pdf although I haven't found any information there related to this topic.

Please improve your question. [edit](https://stackoverflow.com/posts/66294736/edit) it to add some URL related to SPP. https://spp.org/ is not a programming language! Also mention what operating system you are using (Linux, Windows, MacOSX, FreeBSD, ...)? — Basile Starynkevitch, Feb 20 '21 at 18:25

score 1 · Answer 1 · answered Feb 20 '21 at 18:20

Using the C side of your SPP thing, if you have access to the C headers, the simple is use something like

#include <stdio.h>
#include <stdlib.h>

    int main(void)
    {
        char* command = "ls";
        char* args = "*.c";
        char line[80];
        sprintf( line, " %s %s\n", command, args );
        system(line);
    };

But in C you have dirent.h where you can find the functions that does this things. Try man opendir on your machine

OPENDIR(3)                                    Linux Programmer's Manual                                    OPENDIR(3)

NAME
       opendir, fdopendir - open a directory

SYNOPSIS
       #include <sys/types.h>
       #include <dirent.h>

       DIR *opendir(const char *name);
       DIR *fdopendir(int fd);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       fdopendir():
           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _GNU_SOURCE

DESCRIPTION
       The  opendir() function opens a directory stream corresponding to the directory name, and returns a pointer to
       the directory stream.  The stream is positioned at the first entry in the directory.

       The fdopendir() function is like opendir(), but returns a directory stream for the directory  referred  to  by
       the open file descriptor fd.  After a successful call to fdopendir(), fd is used internally by the implementa‐
       tion, and should not otherwise be used by the application.

RETURN VALUE
...

If one is using ifort, then there are also fortran tools for that... if that strikes one's fancy. — Holmz, Feb 22 '21 at 08:21

score 0 · Accepted Answer · answered May 16 '21 at 15:46

First, I would recommend not to use SPP (and IRAF) at all. IRAF is out of official maintainance now, and writing new code for a deprecated software is probably a dead end.

Concerning your question: SPP comes with a function fntopnb() for IRAF style access to filename templates. They are documented at pages 101ff. of the SPP manual. A usage example can be found in the sources of pkg/system/files.x of IRAF:

call salloc (fname, SZ_FNAME, TY_CHAR)

list = fntopnb ("*id*", NO)
while (fntgfnb (list, Memc[fname], SZ_FNAME) != EOF) {
    call printf ("%s\n")
    call pargstr (Memc[fname])
}

call fntclsb (list)

How to refer to string content when using ls

2 Answers2