Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Extracting Parts of String "#" vs "%"
Top Forums UNIX for Dummies Questions & Answers Extracting Parts of String "#" vs "%" Post 302954232 by shah9250 on Saturday 5th of September 2015 06:07:08 PM
Old 09-05-2015
Extracting Parts of String "#" vs "%"
Hello,

I have a question regarding extracting parts of a string and the meaning of # and % in the syntax. I created an example below.

Code:
[root@localhost scriptspractice]# filename=/first/second/third/fourth
[root@localhost scriptspractice]# 
[root@localhost scriptspractice]# echo $filename
/first/second/third/fourth
[root@localhost scriptspractice]# 
[root@localhost scriptspractice]# echo "${filename##*/}"
fourth
[root@localhost scriptspractice]# 
[root@localhost scriptspractice]# echo "${filename%/*}"
/first/second/third

In both of these examples , I wanted to: extract only the fourth part of the string and extract everything but the fourth part of the string, which I did successfully. Conceptually, I wanted to know what is the difference between # and % and why do I need ## in the first example as opposed to just #. Why cannot I use # instead of %? Thanks.
 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

Hi Friends, Can any of you explain me about the below line of code? mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'` Im not able to understand, what exactly it is doing :confused: Any help would be useful for me. Lokesha (4 Replies)
Discussion started by: Lokesha
4 Replies

2. Shell Programming and Scripting

cat $como_file | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g'

hi All, cat file_name | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g' Can this be done by using sed or awk alone (4 Replies)
Discussion started by: harshakusam
4 Replies

3. Shell Programming and Scripting

awk command to replace ";" with "|" and ""|" at diferent places in line of file

Hi, I have line in input file as below: 3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL My expected output for line in the file must be : "1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL" Can someone... (7 Replies)
Discussion started by: shis100
7 Replies

4. Shell Programming and Scripting

how to use "cut" or "awk" or "sed" to remove a string

logs: "/home/abc/public_html/index.php" "/home/abc/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" how to use "cut" or "awk" or "sed" to get the following result: abc abc xyz xyz xyz (8 Replies)
Discussion started by: timmywong
8 Replies

5. Shell Programming and Scripting

grep with "[" and "]" and "dot" within the search string

Hello. Following recommendations for one of my threads, this is working perfectly : #!/bin/bash CNT=$( grep -c -e "some text 1" -e "some text 2" -e "some text 3" "/tmp/log_file.txt" ) Now I need a grep success for some thing like : #!/bin/bash CNT=$( grep -c -e "some text_1... (4 Replies)
Discussion started by: jcdole
4 Replies

6. UNIX for Dummies Questions & Answers

Using "mailx" command to read "to" and "cc" email addreses from input file

How to use "mailx" command to do e-mail reading the input file containing email address, where column 1 has name and column 2 containing “To” e-mail address and column 3 contains “cc” e-mail address to include with same email. Sample input file, email.txt Below is an sample code where... (2 Replies)
Discussion started by: asjaiswal
2 Replies

7. Shell Programming and Scripting

Delete all log files older than 10 day and whose first string of the first line is "MSH" or "<?xml"

Dear Ladies & Gents, I have a requirement to delete all the log files in /var/log/test directory that are older than 10 days and their first line begin with "MSH" or "<?xml" or "FHS". I've put together the following BASH script, but it's erroring out: for filename in $(find /var/log/test... (2 Replies)
Discussion started by: Hiroshi
2 Replies

8. Shell Programming and Scripting

Bash script - Print an ascii file using specific font "Latin Modern Mono 12" "regular" "9"

Hello. System : opensuse leap 42.3 I have a bash script that build a text file. I would like the last command doing : print_cmd -o page-left=43 -o page-right=22 -o page-top=28 -o page-bottom=43 -o font=LatinModernMono12:regular:9 some_file.txt where : print_cmd ::= some printing... (1 Reply)
Discussion started by: jcdole
1 Replies

9. AIX

Apache 2.4 directory cannot display "Last modified" "Size" "Description"

Hi 2 all, i have had AIX 7.2 :/# /usr/IBMAHS/bin/apachectl -v Server version: Apache/2.4.12 (Unix) Server built: May 25 2015 04:58:27 :/#:/# /usr/IBMAHS/bin/apachectl -M Loaded Modules: core_module (static) so_module (static) http_module (static) mpm_worker_module (static) ... (3 Replies)
Discussion started by: penchev
3 Replies

LEARN ABOUT MOJAVE

cpanplus::shell::default::plugins::remote5.18

CPANPLUS::Shell::Default::Plugins::Remote(3pm)		 Perl Programmers Reference Guide	    CPANPLUS::Shell::Default::Plugins::Remote(3pm)

NAME

       CPANPLUS::Shell::Default::Plugins::Remote - connect to a remote CPANPLUS

SYNOPSIS

	   CPAN Terminal> /connect localhost 1337 --user=foo --pass=bar
	   ...
	   CPAN Terminal@localhost> /disconnect

DESCRIPTION

       This is a "CPANPLUS::Shell::Default" plugin that allows you to connect to a machine running an instance of "CPANPLUS::Daemon", allowing
       remote usage of the "CPANPLUS Shell".

       A sample session, updating all modules on a remote machine, might look like this:

	   CPAN Terminal> /connect --user=my_user --pass=secret localhost 1337

	   Connection accepted

	   Successfully connected to 'localhost' on port '11337'

	   Note that no output will appear until a command has completed
	   -- this may take a while

	   CPAN Terminal@localhost> o; i *

	   [....]

	   CPAN Terminal@localhost> /disconnect

	   CPAN Terminal>

BUG REPORTS

       Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

       The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

       This library is free software; you may redistribute and/or modify it under the same terms as Perl itself.

SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell, cpanp

perl v5.18.2							    2014-01-06			    CPANPLUS::Shell::Default::Plugins::Remote(3pm)
All times are GMT -4. The time now is 12:38 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy