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.…
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
bash: Batch Renaming File Extensions
Suppose I need to change the file extensions of certain files in a directory. The directory address specified by the user is read into the script in line 2. This…