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Top Forums Shell Programming and Scripting Grep command is not search the complete pattern Post 302825865 by Don Cragun on Tuesday 25th of June 2013 09:44:16 AM
Old 06-25-2013
The grep utility evaluates basic regular expressions. Unfortunately, (SH?*???????????????US.*) is a filename matching pattern; not a BRE.

To search for lines in a file that match a pattern matching expression, try the following shell script using any shell that recognizes basic Bourne shell syntax (such as ksh and bash):
Code:
INPUT_FILE_T="SH?*???????????????US.*"
while IFS='' read -r f
do      case "$f" in
        ($INPUT_FILE_T) printf "%s\n" "$f";;
        esac
done < PCF_STARHUB_20130625_1

Furthermore, since you didn't quote the expansion of $INPUT_FILE_T in your grep command, the shell expanded that variable into a list of matching filenames in the current directory before calling grep; so (assuming that the file PCF_STARHUB_20130625_1 contained a list of some of the files in the current directory) the command that you ran was expanded by the shell to:
Code:
grep -h SH_5.55916.00.00.100029_20130601_0001_US.csv.gz|349|1700116234 SH_5.55916.00.00.100038_20130601_0001_US.csv.gz|199|2099616349 PCF_STARHUB_20130625_1

which treated SH_5.55916.00.00.100029_20130601_0001_US.csv.gz|349|1700116234 as a basic regular expression that happens to match itself when looking in the file PCF_STARHUB_20130625_1 and, fortunately, doesn't seem to have matched any lines in the file named SH_5.55916.00.00.100038_20130601_0001_US.csv.gz|199|2099616349.

To use grep instead of a loop in the shell, you could translate the filename matching pattern SH?*???????????????US.* to a corresponding BRE (SH..*...............US[.].* or more succinctly SH.\{16,\}US[.].*) and use:
Code:
INPUT_FILE_T_BRE="SH.\{16,\}US[.].*"
grep "$INPUT_FILE_T_BRE" PCF_STARHUB_20130625_1

Note that the double quotes in the above grep command are crucial to keep the shell from trying to expand the BRE as a filename matching pattern
 

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SVK::Log::Filter::Grep(3)				User Contributed Perl Documentation				 SVK::Log::Filter::Grep(3)

SYNOPSIS
SVK::Log::Filter::Grep - search log messages for a given pattern DESCRIPTION
The Grep filter requires a single Perl pattern (regular expression) as its argument. The pattern is then applied to the svn:log property of each revision it receives. If the pattern matches, the revision is allowed to continue down the pipeline. If the pattern fails to match, the pipeline immediately skips to the next revision. The pattern is applied with the /i modifier (case insensitivity). If you want case-sensitivity or other modifications to the behavior of your pattern, you must use the "(?imsx-imsx)" extended pattern (see "perldoc perlre" for details). For example, to search for log messages that match exactly the characters "foo" you might use svk log --filter "grep (?-i)foo" However, to search for "foo" without regards for case, one might try svk log --filter "grep foo" The result of any capturing parentheses inside the pattern are not available. If demand dictates, the Grep filter could be modified to place the captured value somewhere in the stash for other filters to access. If the pattern contains a pipe character ('|'), it must be escaped by preceding it with a '' character. Otherwise, the portion of the pattern after the pipe character is interpreted as the name of a log filter. STASH
/PROPERTY MODIFICATIONS Grep leaves all properties and the stash intact. perl v5.10.0 2008-08-04 SVK::Log::Filter::Grep(3)
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