Use the parameter expansion with regex to remove the special characters from a string in Bash. Use Parameter Expansion 1 2 3 4 5 6 #!/bin/bash string="Hello World! This is a test string." new_string="${string//[^[:alnum:]]/""}" echo "The Modified String: $new_string" Outpu...
In this article, we will explore different ways to remove characters in String in different scenarios such as removing specific characters, removing first
The modified string is: ello In the code above, we use thecutcommand with the-coption to extract the characters from the second position (2) to the end of the string (-). This means that thecutcommand will remove the string’s first character, which is the letter “H” in this case...
Of cause this is just an example data but the actual file contains many other columns but I want to only filter theclear_numbercolumn based ondirectionso this is enough. I want to remove lines that do not contain a list of prefixes, so for example here I would do t...
filename="${filename%.*}" will be the empty string, if the input file name starts with . and contains no further . characters (e.g., .bash_profile) - contrary to convention. --- Thus, the complexity of a robust solution that covers all edge cases calls for a function - see its...
A variable in bash can contain a number, a character, a string of characters, etc. You have no need to declare a variable, just assigning a value to its reference will create it.Example:str="hello world"The above line creates a variable str and assigns "hello world" to it. The value...
Scroll horizontally right N characters, default half the screen width (see the -# option). If a number N is specified, it becomes the default for future RIGHTARROW and LEFTARROW commands. While the text is scrolled, it acts as though the -S option (chop lines) were ...
restore Restore files from a backup created using dump. return Exit a shell function. rev Show contents of a file, reversing the order of characters in every line. rexec Remote execution client for exec server. rexecd Remote execution server. richtext View “richtext” on an ACSII terminal. ...
Quoting is used to remove the special meaning of certain characters or words to the shell. Quoting can be used to disable special treatment for special characters, to prevent reserved words from being recognized as such, and to prevent parameter expansion. ...
Set default values for variables Catch errors that result from variables not being set Remove portions of variables’ values that match patterns Syntax of String Operators The basic idea behind the syntax of string operators is that special characters that denote operations are inserted between the va...