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Suppose i have a string, $str. I want $str to be edited such that all the spaces in it are replaced by underscores.
Example
a="hello world" I want the final output of
echo "$a" to be hello_world
257
$1 means an input argument and -z means non-defined or empty. You're testing whether an input argument to the script was defined when running the script. Follow this answer to receive notifications.
The ${name/pattern/replace} replaces pattern to replace (Bash Parameter Expansion). If pattern starts with / (here pattern is / + Space ), it replaces all the occurencies. Then mv renames file from name to new name with replaced spaces.
Replace All Spaces With Bash. Bash shell supports a find and replace via substitution for string manipulation operation. The syntax is as follows: Replace all matches of Pattern with Replacement.
Open your Ubuntu command line, the Terminal, either through the Application Launcher search or the Ctrl+Alt+T shortcut. Here is the syntax of the command you will be using: I ran the same command to replace spaces with underscores in my Downloads folder:
Bash shell supports a find and replace via substitution for string manipulation operation. The syntax is as follows: $ {varName//Pattern/Replacement} Replace all matches of Pattern with Replacement. x = " This is a test " echo "$ {x// /}" ### replace all spaces with * #### echo "$ {x// /*}" Sample outputs:
Tip: Instead of typing the whole script into you bash file, you can copy it from here and paste in the Terminal by using the Ctrl+Shift+V, or by using the Paste option from the right-click menu. This is how your file will look like:
You could try the following:
str="${str// /_}" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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