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Full Discussion: Shell script debugging
Top Forums Shell Programming and Scripting Shell script debugging Post 302813659 by Don Cragun on Tuesday 28th of May 2013 01:30:50 AM
Old 05-28-2013
We understand that the command:
Code:
cat abc.txt | grep 123

prints any line in the file abc.txt that contains the string "123". We understand that the command:
Code:
grep 123 abc.txt

does exactly the same thing much more efficiently.

You're saying that the command:
Code:
[if $DISPLAY xstatus | $GREP "$right...$right" ]

is running whatever $GREP expands to before it runs the command [if. This will probably give a syntax error because you most likely do not have a utility named [if. Since you won't tell us what error was displayed, you haven't told us what system you're using, you haven't told us what shell you're using, and you won't even use CODE tags; you're asking us to work with our hands tied behind our backs. I can guess that you would probably have better luck with:
Code:
if [ $DISPLAY xstatus | $GREP "$right...$right" ]

but there is no way that we can guess whether or not that might do what you want done with the information you have provided.
This User Gave Thanks to Don Cragun For This Post:
elixir_sinari
 

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LEARN ABOUT X11R4

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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