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Top Forums Shell Programming and Scripting Assigning number of days in the month to a variable Post 302392425 by cmf1985 on Thursday 4th of February 2010 11:11:58 AM
Old 02-04-2010
Hammer & Screwdriver

I guess you can't have nested backticks (`) and probably this is why it's throwing those errors.

You could try $() instead of ``, as in:

Code:
X=`cal $(date +%m) $(date +%Y) | grep -v '[A-Za-z]' | wc -w`

This works for me.
 

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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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