Command SNAME=$(basename “$(test -L “$0” && readlink “$0” || echo “$0″)”) While running a bash script using Linux terminal the script name can also passed as argument at $0. but if we are using full path of script to execute, it will show full path as results when print value of $0. So use...
Command: str3=”$str1 $str2″ The above example command will concatenate values of str1 and str2 stings and store it in third variable str3. Make sure there should not be any space before or after the assignment ( = ) operator. Example 1: It is simply write two or more strings variable one after one for...
Command: if [ “$str1” == “$str2” ] Example: Take input of two string in a script and compare if both are same or not, using if statement. Create a bash script using below content and execute. It will prompt for two strings from user and check if both string are same or not. #!/bin/bash...
Command: while true;do echo “Press CTRL+C to Exit”; done Example 1: Some times we are required to execute some commands or processes continuously until stop it forcefully or conditionally. The following example of while loop will run continuously until stopped forcefully using ctrl + c. while true do echo "Press CTRL+C to Exit" done...
Command: echo -e “\\e[0;41mBackground in Red Color\\e[0m” The Above commands are using to set background color of output on Linux bash shell. In The output of above command background will be in red color. There are many other colors available which you can use defined as below. Just replace “0;41” with other color values...
# echo -e “e[0;31mText in Red Colore[0m” The Above commands are showing to set foreground ( Text ) color of output on Linux bash shell. The output of above command will be in red color. There are many other colors available which you can use defined as below. Just replace “0;31” with other color...
Questions – How can I print a newline as \n in bash shell? How to use \n in shell script to print new line. Issues – Echo newline in bash shell prints literal \n but not new line. Printing literal ‘\n’ in nested print new line in bash scripts. Command: Use the following command...
Command: # read var # read -s “Waiting for input: ” var Uses: read command is used for getting user input in a Linux shell script. -p switch with read command is used for showing some helpful text on-screen. Create a shell script named input.sh and add following content. #!/bin/bash read -p "Enter Your...
With the minimum installation of any Linux operating system, you will not see most of the commands in your system. In minimum operating system installation only required packages are installed for running an operating system and skipped unnecessary packages. mail command is useful for sending emails from Linux command line which is used for...
While working with bash programming, we many times need to check if a file already exists, create new files, insert data in files. Also sometimes we required executing other scripts from other scripts. This article has few details about the test if file or directory exists in the system. Which can be very helpful...