In the shell command language, an entity that stores values. There are three types of parameters: variables (named parameters), positional parameters, and special parameters. Parameter expansion is accomplished by introducing a parameter with the '$' character.
--
"Parameter expansion" is the way to get the value that is stored in a parameter ( for example a variable )
So for example if you have a variable foo and you give it the value bar
, then the variable foo contains the value bar.
Then, to get the content of the variable foo, you prepend a $ sign:
Last edited by Scrutinizer; 11-02-2017 at 12:28 PM..
hey there
im a bit stuck on executing commands that include the special character '?'. can someone recommend a way on how i would be able to execute it?? i thought the glob function could be useful (still mite be) but upon entering the command
'ls pars?' it listed all the files in the... (1 Reply)
Hello,
I've had a daemon go a little bit mental and create directories using somments from a config file. The end result is I've ended up with directories with names such as #, 5625), (5725 etc etc etc...
However, when I try and delete them I get syntax errors, ( not expected,
rmdir #... (2 Replies)
Hi,
I am trying to unload file from a database. Which contains few lines with the character below. Rest of the data was unloaded appropriately.
a) What does this below character means?
b) How can i remove it,
I already have sed '/^$/d'
c) Will this effect the file by any means... (4 Replies)
Hi
I am comparing 2 files (using diff command) with numerical data in them. In the output file I want only the differences which are in file2 but not in file1. Although I am getting the diffences i am also getting special characters in the output file which i do not want. Can somebody help me
For... (3 Replies)
Hi,
In the shell script, i need to remove the special charater "\" with "\\". For example, i need to replace "D:\FXT\ABC.TXT" with "D:\\FXT\\ABC.TXT".
However, when trying to do something like , i get the below error :-
-->echo "D:\FXT\ABC.TXT" | sed -e 's#\#\\#g'
sed: 0602-404 Function... (7 Replies)
I have below line in a unix file, I want to delete one character after "Â".
20091020.Non-Agency CMO Daily Trade Recap Â~V Hybrids
The result should be :
20091020.Non-Agency CMO Daily Trade Recap  Hybrids
i dont want to use "~V" anywhere in the sed command or any other command, just remove... (1 Reply)
When editing a file, vi displays a special character as ^L. Can you tell me the escaped character to be used in awk? And can that escaped character be used in a regexp in both sed and awk? (7 Replies)
a='CASH$$A'
/usr/xpg4/bin/grep -F "$a" *.txt
It is not able to grep CASH$$A string as it contains special character $$.
I also tried with
/usr/xpg4/bin/grep -F '$a' *.txt
but still not working.
I have to assign CASH$$A to a variable and serach that variable..i dont want to search the... (8 Replies)
Hi,
on ksh
What does the following do?
grep -v "toolbox" $home_oracle/.profile >$home_oracle/.profile.$$ Thanks.
Please use CODE tags as required by forum rules! (3 Replies)
Discussion started by: big123456
3 Replies
LEARN ABOUT DEBIAN
template::plugin::url
Template::Plugin::URL(3pm) User Contributed Perl Documentation Template::Plugin::URL(3pm)NAME
Template::Plugin::URL - Plugin to construct complex URLs
SYNOPSIS
[% USE url('/cgi-bin/foo.pl') %]
[% url(debug = 1, id = 123) %]
# ==> /cgi/bin/foo.pl?debug=1&id=123
[% USE mycgi = url('/cgi-bin/bar.pl', mode='browse', debug=1) %]
[% mycgi %]
# ==> /cgi/bin/bar.pl?mode=browse&debug=1
[% mycgi(mode='submit') %]
# ==> /cgi/bin/bar.pl?mode=submit&debug=1
[% mycgi(debug='d2 p0', id='D4-2k[4]') %]
# ==> /cgi-bin/bar.pl?mode=browse&debug=d2%20p0&id=D4-2k%5B4%5D
DESCRIPTION
The "URL" plugin can be used to construct complex URLs from a base stem and a hash array of additional query parameters.
The constructor should be passed a base URL and optionally, a hash array reference of default parameters and values. Used from with a
template, it would look something like the following:
[% USE url('http://www.somewhere.com/cgi-bin/foo.pl') %]
[% USE url('/cgi-bin/bar.pl', mode='browse') %]
[% USE url('/cgi-bin/baz.pl', mode='browse', debug=1) %]
When the plugin is then called without any arguments, the default base and parameters are returned as a formatted query string.
[% url %]
For the above three examples, these will produce the following outputs:
http://www.somewhere.com/cgi-bin/foo.pl
/cgi-bin/bar.pl?mode=browse
/cgi-bin/baz.pl?mode=browse&debug=1
Note that additional parameters are separated by '"&"' rather than simply '"&"'. This is the correct behaviour for HTML pages but is,
unfortunately, incorrect when creating URLs that do not need to be encoded safely for HTML. This is likely to be corrected in a future
version of the plugin (most probably with TT3). In the mean time, you can set $Template::Plugin::URL::JOINT to "&" to get the correct
behaviour.
Additional parameters may be also be specified to the URL:
[% url(mode='submit', id='wiz') %]
Which, for the same three examples, produces:
http://www.somewhere.com/cgi-bin/foo.pl?mode=submit&id=wiz
/cgi-bin/bar.pl?mode=browse&id=wiz
/cgi-bin/baz.pl?mode=browse&debug=1&id=wiz
A new base URL may also be specified as the first option:
[% url('/cgi-bin/waz.pl', test=1) %]
producing
/cgi-bin/waz.pl?test=1
/cgi-bin/waz.pl?mode=browse&test=1
/cgi-bin/waz.pl?mode=browse&debug=1&test=1
The ordering of the parameters is non-deterministic due to fact that Perl's hashes themselves are unordered. This isn't a problem as the
ordering of CGI parameters is insignificant (to the best of my knowledge). All values will be properly escaped thanks to some code
borrowed from Lincoln Stein's "CGI" module. e.g.
[% USE url('/cgi-bin/woz.pl') %]
[% url(name="Elrich von Benjy d'Weiro") %]
Here the spaces and ""'"" character are escaped in the output:
/cgi-bin/woz.pl?name=Elrich%20von%20Benjy%20d%27Weiro
An alternate name may be provided for the plugin at construction time as per regular Template Toolkit syntax.
[% USE mycgi = url('cgi-bin/min.pl') %]
[% mycgi(debug=1) %]
AUTHOR
Andy Wardley <abw@wardley.org> <http://wardley.org/>
COPYRIGHT
Copyright (C) 1996-2007 Andy Wardley. All Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
Template::Plugin
perl v5.14.2 2011-12-20 Template::Plugin::URL(3pm)