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Full Discussion: Shell script help: not working as I like
Homework and Emergencies Homework & Coursework Questions Shell script help: not working as I like Post 303008000 by Don Cragun on Friday 24th of November 2017 08:44:36 PM
Old 11-24-2017
There are sometimes reasons to store output from a pipeline in a variable and then print the contents of the variable, but you haven't shown us any reason to do that here. Why are you using a variable?

It is ALWAYS a good idea to tell us what operating system and shell you're using when you start a thread in the UNIX & Linux forums. Although most BSD, Linux, and UNIX system commands produce similar output when using common tools and options, there are variations. Knowing what OS and shell you're using helps us avoid suggesting code that will not work in your environment.

If you take your code:
Code:
CS_STUDENTS=$(grep -n '\<CS\>' smallFile)

echo $CS_STUDENTS

and change it to:
Code:
CS_STUDENTS=$(grep -n '\<CS\>' smallFile)

echo Unquoted:$CS_STUDENTS
echo 'Single-Quoted:$CS_STUDENTS'
echo "Double-Quoted:$CS_STUDENTS"

what happens?

You may want to look at the man page for your shell and search for a section titled "Quoting" to see how single-quotes, double-quotes, and back-quotes affect command-line arguments.
 

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LEARN ABOUT PHP

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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