Bash Shell Programming HowTos

Tutorials, howtos and programming tips about GNU Bourne-Again SHell (BASH) for Apple OS X, Linux, *BSD and Unix like operating systems. ( rss feed )

Linux / Unix: Shell Remove Empty Lines

by on April 24, 2013 · 1 comment

I am a new Linux user. I have text files with lots of empty lines. How do I delete all empty lines under Linux or Unix operating systems?

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Bash: .* Considered Harmful To Match Dot Files. Why?

by on April 24, 2013 · 4 comments

How do I match dot files under Unix / Linux using bash shell? Why .* considered as harmful when matching dot files under bash shell?

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HowTo: Unix rm All Files In a Directory

by on April 24, 2013 · 3 comments

I am a new Unix user. How do I rm (remove) all files in a directory called personal-files under Unix like operating systems?

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Bash Function: Find Number Of Arguments Passed

by on April 24, 2013 · 1 comment

How do I find out number of arguments passed to my bash function called foo() under Unix like operating systems?

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HowTo: Check If a Directory Exists In a Shell Script

by on April 14, 2013 · 1 comment

How do I check if a directory exists in a shell script under Linux or Unix like operating systems?

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AWK: Remove All Blank Spaces From String / Field

by on April 14, 2013 · 6 comments

I need to parse the following text file:

# example.net config
user = www30021
group = ftp30020
uid = 30021
gid = 30020
tmp_path = /netapp42/shared/www/images/host.example.com/tmp.bin
tmp_perms = defaults,nodev,nosuid,noexec
jail = on
location = /jails/apache/h/host.example.com/
sftp = on
ftps = off
php-cgi = on
perl-cgi = off
I need to find out value for each field and remove any blank spaces / white spaces from the field. How do I solve this problem using awk under Linux or Unix like operating systems?

{ 6 comments }

Linux / Unix Shell Script: Get The Current Directory

by on April 9, 2013 · 0 comments

I am working on a shell script. I need to find out the current working directory. How do I get the current working directory under Bash or Ksh shell running on Linux or Unix like operating systems?

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