05-20-2010
I want to put `tail -f filename | grep -i -E 'error|warning'` into a variable and construct an e-mail that report any lines that contain "error" or "warning", after that, I will send the mail to the address specified in the RECIPIENT shell variable which is defined within the script.
I have tried `tail -f filename | grep -i -E 'error|warning'` in the terminal, there is no problem that it displayed last(sorry it is not the 'first' I just posted) 10 lines of the file which contain "error" and "warning" firstly, and then wait for the file to grow and check the next line if it is contain the keywords.
also , the `grep -i -E 'error|warning'`, is it correct that it can grep all the "error" or "warning" in any combination of upper and lower case letters?
Thanks!
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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)