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Full Discussion: Bash script to find comments in file
Top Forums Shell Programming and Scripting Bash script to find comments in file Post 302925893 by Don Cragun on Thursday 20th of November 2014 02:35:18 AM
Old 11-20-2014
For the purposes of this exercise, how do you define "comment"?

A basic outline of what you want is something like:
Code:
#!/bin/bash
n=1
while read -r line
do      if [ comment_present ]
        then    printf '%d\t%s\n' $n "$line"
        fi
        n=$((n + 1))
done < file

If you assume that any line containing an octothorpe (#) has a comment, comment_present could be:
Code:
"$line" != "${line#*#}"

but, of course, that will treat quoted and backslash escaped octothorpes as comments when bash would not.

Writing a full parser to find C or shell or some other language's comments accurately in bash is a non-trivial challenge.
Last edited by Don Cragun; 11-20-2014 at 03:38 AM.. Reason: Print line number and line; not just line number.
This User Gave Thanks to Don Cragun For This Post:
ksmarine1980
 

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LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

BSD
								September 27, 2014							       BSD
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