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Full Discussion: Loop grep, outputs in files
Top Forums UNIX for Beginners Questions & Answers Loop grep, outputs in files Post 302989357 by Corona688 on Wednesday 11th of January 2017 11:58:29 AM
Old 01-11-2017
Code:
for((b=$1 ...

$1 is not the numeral one, but the script's first commandline parameter. Try it without the dollar sign.

Are you trying to simultaneously read from and write to the same file? That won't work, that will destroy your data.
 

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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 is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci- fied, 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 zgrep is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep zgrep string files for csh: (setenv GREP fgrep; zgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1) ZGREP(1)
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