04-01-2008
PGM=${0##/}
TMP=/tmp/${PGM}.$$
$0 is the complete-name-of-the-script in side the script (e.g. /home/mydir/myscript.sh)
So, ${0##/} means the complete-name-of-the-script without the starting-slash (if it exists)!!
But, what I thing you wanted to write is:
PGM=${0##*/}
which means complete-name-of-the-script without everthing up to and including the last-slash (e.g. myscript.sh)
Then, $$ is the Process-ID of the current script. So, TMP will be set to be /tmp/myscript.sh.1234 (where 1234 is the process-id).
This combination is normally used to create unique (i.e. different for each running script) names.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
zsh 4.3.4% cat file
ACFCFACCACARCSHFARCVJVASTVAJFTVAJVGHBAJ
zsh 4.3.4% cat file1
A
C
F
R
zsh 4.3.4% <file1 while read;do printf "%s=%d\n" "$REPLY" "${#$(<file)//}";done
A=9
C=7
F=4
R=2
That was the previous post.
But , can anybody can explain me in detail about this line
zsh... (2 Replies)
Discussion started by: dummy_needhelp
2 Replies
2. Shell Programming and Scripting
could u please convert the below statement to shell script
----------
logdir=/smp/dyn/logfiles/cpm/pgm/pgIm
$logdir = $logdir ."/pgIm${toDate}*";
----
could u please explain the below clearly
grep -i adding $logdir | grep -iv equation | awk '{print \$NF}' | sort -u | sed -e... (1 Reply)
Discussion started by: mail2sant
1 Replies
3. AIX
this is the mksys b script....
can anyone explain .. what # and 1 in if condition
this is the first line of the script... it is not from middle of the script....
if
then
echo "Not enough parameters, need a client name for mksysb"
Usage="Usage: $0 <client name>"
... (2 Replies)
Discussion started by: honeym210
2 Replies
4. UNIX for Dummies Questions & Answers
if
then
echo "Syntax: $0 <sid> <COLD/HOT> <DEST>"
exit
fi
if --------------what does this mean???
echo "Syntax: $0 <sid> <COLD/HOT> <DEST>"---pls explain this as well (2 Replies)
Discussion started by: appsdba.nitin
2 Replies
5. Shell Programming and Scripting
hi all i have an example i want one help me to understand cause i tried to test it but almost fail and i don't know how can i solve this problem " the main idea to read from two files and replace something from one to another " but i don't understand why it fail all time
$ cat main.txt... (4 Replies)
Discussion started by: maxim42
4 Replies
6. Homework & Coursework Questions
1. The problem statement, all variables and given/known data:
I have a retake assignment to complete for my computer networks and OS class. This isn't really my area, had I known last year I could have swapped it for a different module I would have done so. I'm determined to get through it... (6 Replies)
Discussion started by: Squall Moogle
6 Replies
7. Shell Programming and Scripting
I'm trying to follow a script and I see it begins with this:
if ; then
if ; then
print "blah $0 blah blah "
exit
fi
fi
What does $# mean? I found out that $1 refers to the shell environment and the last argument that was entered or passed in the previous command. I couldn't find $#... (2 Replies)
Discussion started by: MaindotC
2 Replies
8. Shell Programming and Scripting
why the case 2 will happen ? , ' should stop the history substitution ,shouldn't it?
case 1
# echo "123"|sed '/123/!d'
123
case 2
# echo "123
> 456
> 1
> "|sed '/123/!d'
-bash: !d': event not found
case 3
# echo "123
> 456
> 12
> "|sed '/123/'\!d
123
# bash --version (1 Reply)
Discussion started by: justlooks
1 Replies
9. Shell Programming and Scripting
Can someone do me a favour and explain the following for me:
((r=$RANDOM%$n+1))
I know what $RANDOM does but what is % sign and what does it do with %$n+1? (2 Replies)
Discussion started by: bashily
2 Replies
10. UNIX for Dummies Questions & Answers
Hi friends! I'm learning UNIX and I have a small question. Working with Shell, i put the name of one executable (in c language) + one number and it says this:
$ gcc misterioso_4.c
$ ./misterioso_4 6
got: ,
I can not find an answer in the manual because I havent applied any variable.... (5 Replies)
Discussion started by: dakota
5 Replies
LEARN ABOUT DEBIAN
catalyst::controller::sru
Catalyst::Controller::SRU(3pm) User Contributed Perl Documentation Catalyst::Controller::SRU(3pm)
NAME
Catalyst::Controller::SRU - Dispatch SRU methods with Catalyst
SYNOPSIS
package MyApp::Controller::SRU;
# use it as a base controller
use base qw( Catalyst::Controller::SRU );
# explain, scan and searchretrieve methods
sub explain {
my ( $self, $c,
$sru_request, # ISA SRU::Request::Explain
$sru_response, # ISA SRU::Response::Explain
) = @_;
}
sub scan {
my ( $self, $c,
$sru_request, # ISA SRU::Request::Scan
$sru_response, # ISA SRU::Response::Scan
$cql, # ISA CQL::Parser root node
) = @_;
}
sub searchRetrieve {
my ( $self, $c,
$sru_request, # ISA SRU::Request::SearchRetrieve
$sru_response, # ISA SRU::Response::SearchRetrieve
$cql, # ISA CQL::Parser root node
) = @_;
}
DESCRIPTION
This module allows your controller class to dispatch SRU actions ("explain", "scan", and "searchRetrieve") from its own class.
METHODS
index : Private
This method will create an SRU request, response and possibly a CQL object based on the type of SRU request it finds. It will then pass the
data over to your customized method.
SEE ALSO
o Catalyst
AUTHOR
Brian Cassidy <bricas@cpan.org>
COPYRIGHT AND LICENSE
Copyright 2005-2009 by Brian Cassidy
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.12.4 2009-12-02 Catalyst::Controller::SRU(3pm)