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Top Forums UNIX for Dummies Questions & Answers extracting date from a filename Post 302261763 by prsshini on Tuesday 25th of November 2008 01:59:13 PM
Old 11-25-2008
I have a similar issue.
I grep for a pattern in a list of files.
"grep -i -l $pattern *.datx*"
it may give me n number of files.

say for eg, it gives 2 files.
lock_eicu_20071228_00000000.dat_20071228_05343100
lock_eicu_20080501_00000000.dat_20080501_05343900

out of these 2 files I need to get the latest file according to the date present after the .dat extn.
so in the above eg, i need to get the filename
lock_eicu_20080501_00000000.dat_20080501_05343900

can u please help.
 

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BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME
bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression SYNOPSIS
bzgrep [ grep_options ] [ -e ] pattern filename... bzegrep [ egrep_options ] [ -e ] pattern filename... bzfgrep [ fgrep_options ] [ -e ] pattern filename... DESCRIPTION
Bzgrep is used to invoke the grep on bzip2-compressed files. All 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 bzgrep is invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, bzgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep bzgrep string files for csh: (setenv GREP fgrep; bzgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux. SEE ALSO
grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1) BZGREP(1)
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