This type of for loop is characterized by counting. The range is specified by a beginning (#1) and ending number (#5). The for loop executes a sequence of commands for each member in a list of items. A representative example in BASH is as follows to display welcome message 5 times wit...
This tutorial will discuss a quick way to use Bash to rename files from a specific extension to another. We will use a bash loop, find, rename, and the mv command for this one. Method 1: Bash loop The most common way to change file extensions recursively in a directory is to use a ...
Loop Over Directory Let’s loop over the newly createdtestdirectory and display the file names inside the directory. We’ll useforloop to do this. ~/test$forfilein*;doecho$file;done Navigate to thetestdirectory and enter the above command after$.*denotes all files inside the directory. ...
In the linefor file in $(ls); do, the$(ls)part executes the ‘ls’ command then and its output (the list of files in the current directory) is used as input for the loop. The loop will iterate through each file name found in the output. The lineecho "File: $file"prints the va...
First, let’s confirm that we have the text files in our directory using the “ls” command. Next, let’s create our Bash “for” loop that checks the available files on the directory and lists those with the “.txt” extension. In the “do” section, we use the echo command to li...
All the statements between do and done are executed repeatedly until the value of expr2 is TRUE. After each iteration of the loop, expr3 is evaluated. This is usually used to increment a loop counter. The following 12 examples shows how to bash for loops in different ways. 1. Static val...
In the example above: Thels commandlists all files in the current directory. Theforloop iterates through each file. ${file##*.}extracts the file extension by removing everything up to the last dot in the filename. If found, thecasestatement compares theextensionand outputs the file type....
There are two types of bash for loops available. One using the “in” keyword with list of values, another using the C programming like syntax. This article is part of our on-going bash tutorial series. This explains both of the bash for loop methods, an
dirs=`ls "$1"` #echo "Dirs: $dirs" # Just to confirm if all is well IFS=$'\n' # Loop through and print for i in $dirs; do if [ -f "$i" ]; then echo "File: $i" elif [ -d "$i" ]; then echo "Directory: $i" fi done ...
In the above bash for command syntax, Before the first iteration, expr1 is evaluated. This is usually used to initialize variables for the loop. All the statements between do and done are executed repeatedly until the value of expr2 is TRUE. ...