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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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CG(1)																	     CG(1)

NAME
cg - Recursively grep for a pattern and store it. SYNOPSIS
cg [ -l ] | [ [ -i ] pattern [ files ] ] DESCRIPTION
cg does a search though text files (usually source code) recursively for a pattern, storing matches and displaying the output in a human- readable fashion. It is intended to give some of the functionaly of AT&T's cscope(1) tool, with the advantages of simplicity and not being language-specific. The script will colorize output if configured as such. It is typically run with a Perl regular expression to search for. The search can be made case insensitive by using the -i option. A list of files may also be specified with an additional argument after the pattern. Put the files pattern in quotes to make it be matched by Perl rather than by the shell. Running the script with no arguments will recall the results of the previous search. After the search, entries found can be edited using the vg(1) script. The -l option shows the last log made. SOME EXAMPLES
cg - alone recalls the previous search results. cg -i pattern - search the default list of files for all files matching the pattern (and case-insensitively). cg pattern '*.c' - search recursively for pattern in all *.c files. This automatically converts '*' to '.*' and '.' to '.' for you and does a Perl pattern match on all files in the tree. cg pattern *.c - search through the shell-expanded list of *.c files, so not done recursively (in other words, only the files your shell pass to the script as arguments). cg -l - show the last log made. COMMAND-LINE OPTIONS -i Do a case-insensitive search. -l Show the last log made. -p Toggle the default pager option. cg has a bulit-in pager function, which can be enabled or disabled by default (in .cgvgrc). If the default is enabled, this option disables the pager; if the default is disabled, this option enables it. -P Force the built-in pager to be disabled. FILES
${HOME}/.cglast Log file of the last search. ${HOME}/.cgvgrc Per-user configuration file (if the defaults are not desireable). ${HOME}/.cgvg/* Log files in $HOSTNAME.shell_pid form with the log of the last search. SEE ALSO
vg(1), perl(1), find(1), grep(1), cscope(1) AUTHOR
cg was written by Joshua Uziel <uzi@uzix.org>. 13 Mar 2002 CG(1)
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