PERL script -- calling 'sed' by passing 'variable value'.
Hi Friends,
I'm calling 'sed' command inside one perl script, which is to list directory names which are having some date value as their names (in the form YYYYMMDD) with in the range (start and end date).
Code:
#!/usr/bin/perl -w
use strict;
use warnings;
my $DATA = "/export/home/ganapa";
my $report_start_date = $ARGV[0];
my $report_end_date = (scalar(@ARGV) == 1) ? $ARGV[0] : $ARGV[1];
system ("echo '$report_start_date'");
system ("echo '$report_end_date'");
my @selected_rundates = system ("ls -1 $DATA | sed -n \"\/20101101\/,\/20101210\/p\"");
print "@selected_rundates\n";
The above script is working exactly as it should. This code is selecting and printing date named directories between the selected range.
But if I pass variable names, instead of hard coded values (20101101 and 20101210) along with 'sed' command, script will not print any thing !!
In the below line, I'm just replacing hard coded dates with date variables.
But, it is not printing anything!
Code:
my @selected_rundates = system ("ls -1 $RWOUTPUT | sed -n \"\/$report_start_date\/,\/$report_end_date\/p\"");
I tried all possibilities, but couldn't able to figure out the problem with the above piece of code.
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Thanks ,
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=============
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sed '$xq;d' filename
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Discussion started by: NileshJ
6 Replies
LEARN ABOUT LINUX
shtool-subst
SHTOOL-SUBST.TMP(1) GNU Portable Shell Tool SHTOOL-SUBST.TMP(1)NAME
shtool-subst - GNU shtool sed(1) substitution operations
SYNOPSIS
shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
[-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]
DESCRIPTION
This command applies one or more sed(1) substitution operations to stdin or any number of files.
OPTIONS
The following command line options are available.
-v, --verbose
Display some processing information.
-t, --trace
Enable the output of the essential shell commands which are executed.
-n, --nop
No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.
-w, --warning
Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
operations resulted in no content change on all files.
-q, --quiet
Suppress warning on substitution operation resulting in no content change.
-s, --stealth
Stealth operation. Preserve timestamp on file.
-i, --interactive
Enter interactive mode where the user has to approve each operation.
-b, --backup ext
Preserve backup of original file using file name extension ext. Default is to overwrite the original file.
-e, --exec cmd
Specify sed(1) command directly.
-f, --file cmd-file
Read sed(1) command from file.
EXAMPLE
# shell script
shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]
# RPM spec-file
%install
shtool subst -v -n
-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g'
-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g'
`find . -name Makefile -print`
make install
HISTORY
The GNU shtool subst command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 2001 for GNU shtool. It was prompted
by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.
SEE ALSO shtool(1), sed(1).
18-Jul-2008 shtool 2.0.8 SHTOOL-SUBST.TMP(1)
12-13-2010
PERL script -- calling 'sed' by passing 'variable value'.
