bash shell scripting
A shell script is a code (script) written for the shell or command line interpreter of an operating system such as Unix. It allows users to automate tasks which would…
Reading files in a directory using bash
The following code reads files in a directory called SQL. Then if runs an SQL command with the file name as input. Finally, it deletes the file from the directory.
Using ls to display a file tree
Recently, I found a really elegant solution to display a file tree using the ls command. I like is so much that I feel the need to share it. The…
Bash: using positional parameter
Positional parameters are used to pass arguments to a command line application. This post shows you how to used positional parameter in bash. On your terminal, type the following command:…
for loop in bash
For loops in bash a similar to commonly used languages such as Perl and C. bash loops do not use curly brackets for body demarcation. Example 1 Loop start from…
bash: How to escape single quotes single quotes
In bash, you can use the backslash character (“\”) to escape any character. However, if a single quote is inside single quotes, it cannot be escaped with a backslash character.…
How to pipe the output of locate to ls
locate command can be used to search for files. Locate command is good at search an index but not great at listing the results. To get better listing features, you…
bash: How to display image properties
The following bash script shows how to capture image properties from ImageMagick: xa.jpg is an image which is stored in the same directory as this script. identify is an ImageMagick…
/bin/rm: cannot execute [Argument list too long]
Error Cause rm can only handle a certain number of arguments. If you run following command in a directory of 500 json files, the argument list is 500 Solution Use…
Reading content of a file using bash
The following code read the contents of a text file To read first five lines only Read five lines and then delete those lines