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Full Discussion: Egrep ERE to find null
Top Forums Shell Programming and Scripting Egrep ERE to find null Post 302801929 by MadeInGermany on Thursday 2nd of May 2013 05:14:25 PM
Old 05-02-2013
The main thing is the "quotes".
Please run the script, enter a * and see what happens...

Code:
echo -n x

suppresses line feed
Therefore the escape with
Code:
echo x-n x

But actually not needed when quoted
Code:
echo "-n x"

You don't need back-ticks and count the output characters if you take the exit status from egrep, as in my example.

---------- Post updated at 04:14 PM ---------- Previous update was at 04:05 PM ----------

while ! can be written as until

Code:
until echo "$jobname" | egrep '^[^[:blank:]]+$' >/dev/null
do
...

 

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XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME
xzgrep - search compressed files for a regular expression SYNOPSIS
xzgrep [grep_options] [-e] pattern file... xzegrep ... xzfgrep ... lzgrep ... lzegrep ... lzfgrep ... DESCRIPTION
xzgrep invokes grep(1) on files which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed directly to grep(1). If no file is specified, then the standard input is decompressed if necessary and fed to grep(1). When reading from standard input, gzip(1) and bzip2(1) compressed files are not supported. If xzgrep is invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1). The same applies to names lzgrep, lze- grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils. ENVIRONMENT
GREP If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1). SEE ALSO
grep(1), xz(1), gzip(1), bzip2(1), zgrep(1) Tukaani 2009-07-05 XZGREP(1)
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