What does tr do in shell?
tr is a command-line utility in Linux and Unix systems that translates, deletes, and squeezes characters from the standard input and writes the result to the standard output.
How does tr work in Linux?
The tr command reads a byte stream from standard input (stdin), translates or deletes characters, then writes the result to the standard output (stdout). If we don’t pass any options to tr, it will replace each character in SET1 with each character in the same position in SET2.
How do I trim a string in bash?
There is a built-in function named trim() for trimming in many standard programming languages. Bash has no built-in function to trim string data. But many options are available in bash to remove unwanted characters from string data, such as parameter expansion, sed, awk, xargs, etc.
How to use tr command in Bash?
tr command uses –s option for search and replace any string from a text. In the following example, space (‘ ‘) is replaced by tab (‘\’). $ echo “BASH Programming” | tr -s ‘ ‘ ‘\’ You can use both -c and -s options together with tr command.
What is Bash variable in string?
In this topic, we are going to learn about Bash Variable in String. In the programming world, the variable is thought to be an advanced programming concept, where the programmer would use variable only when the value is not known to the code from the start. For example, if we write a program to calculate the sum of 10 & 20.
What is the data type of string in Bash?
If you are familiar with variables in bash, you already know that there are no separate data types for string, int etc. Everything is a variable. But this doesn’t mean that you don’t have string manipulation functions.
How to change the case of the string in tr command?
The option and stringValue2 are optional for the `tr` command. You can use – c, -s and -d option with the `tr` command to do different types of tasks. You can change the case of the string very easily by using tr command. To define uppercase, you can use [:upper:] or [A-Z] and to define lowercase you can define [:lower:] or [a-z].