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Top Forums UNIX for Beginners Questions & Answers How to avoid arguments inside Nawk command? Post 303004653 by bakunin on Thursday 5th of October 2017 10:08:16 PM
Old 10-05-2017
This line:

Quote:
Originally Posted by mohtashims
Code:
echo "/usr/ucb/ps auxwww | grep $i | grep $2 | grep -v grep | nawk 'NR==1{print $2}'"

Won't work - at least not in the way you perhaps supposed it to work: the shell maintains one (only one!) flag of sorts for being inside or outside of a quotation. That means quotes cannot be nested and this:

Code:
"some-string 'foo bar' other string"

is NOT a single-quoted string inside a double-quoted string but in fact a double-quoted string with just a few single-quote-characters in it. In other words: the single-quotes lose their special meaning inside double-quotes.

This is why "...$2...." and "...'$2'..." are basically the same.

I hope this helps.

bakunin
 

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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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