Echoing a variable comes out with lots of white space

1. How do you echo space in shell?
2. What is Echo variable?
3. How do I check if a variable is empty in shell script?
4. How do I print a space in bash?
5. How do I use tab space in Linux?
6. Is a special character in bash?
7. How does echo store value in variable?
8. What does echo do in bash?
9. How does echo function?
10. How do you clear a variable in bash?
11. How do I check if an environment variable is set in bash?
12. How do I check if an environment variable is set?

How do you echo space in shell?

15 Practical Examples of 'echo' command in Linux

1. Input a line of text and display on standard output $ echo Tecmint is a community of Linux Nerds. ...
2. Declare a variable and echo its value. ...
3. Using option '\b' – backspace with backslash interpretor '-e' which removes all the spaces in between.

What is Echo variable?

Variables are an essential feature of bash programming in which we assign a label or name to refer to other quantities: such as an arithmetic command or a value. They are used to make the machine programs more readable for humans. Using the echo command you can display the output of a variable or line of text.

How do I check if a variable is empty in shell script?

To find out if a bash variable is empty:

1. Return true if a bash variable is unset or set to the empty string: if [ -z "$var" ];
2. Another option: [ -z "$var" ] && echo "Empty"
3. Determine if a bash variable is empty: [[ ! -z "$var" ]] && echo "Not empty" || echo "Empty"

How do I print a space in bash?

1. printf "$var" – Inian Jul 25 '18 at 13:13.
2. @Inian yes it works – Kenenbek Arzymatov Jul 25 '18 at 13:15.
3. printf "$var" only works if there is no %s or similar in the string. Better use printf "%s\n" "$var" or plain old simple echo "$var" . – ...
4. Or just: printf '%s' "$x $y" – Benjamin Barrois Jul 25 '18 at 13:18.

How do I use tab space in Linux?

To convert tabs in a text file to spaces, you can use the expand command. To convert each tab to a single space character, use the -t 1 option.

Is a special character in bash?

Special characters. Some characters are evaluated by Bash to have a non-literal meaning. Instead, these characters carry out a special instruction, or have an alternate meaning; they are called "special characters", or "meta-characters".

How does echo store value in variable?

To store the output of a command in a variable, you can use the shell command substitution feature in the forms below: variable_name=$(command) variable_name=$(command [option ...] arg1 arg2 ...) OR variable_name='command' variable_name='command [option ...] arg1 arg2 ...'

What does echo do in bash?

In computing, echo is a command that outputs the strings it is being passed as arguments. It is a command available in various operating system shells and typically used in shell scripts and batch files to output status text to the screen or a computer file, or as a source part of a pipeline.

How does echo function?

The echo() function outputs one or more strings.

1. Note: The echo() function is not actually a function, so you are not required to use parentheses with it. ...
2. Tip: The echo() function is slightly faster than print().
3. Tip: The echo() function also has a shortcut syntax.

How do you clear a variable in bash?

To Clear these session-wide environment variables following commands can be used:

1. Using env. By default, "env" command lists all the current environment variables. ...
2. Using unset. Another way to clear local environment variable is by using unset command. ...
3. Set the variable name to ”

How do I check if an environment variable is set in bash?

To confirm whether a variable is set or not in Bash Scripting, we can use -v var or -z $var options as an expression with the combination of 'if' conditional command.

How do I check if an environment variable is set?

On Windows

Select Start > All Programs > Accessories > Command Prompt. In the command window that opens, enter echo %VARIABLE%. Replace VARIABLE with the name of the environment variable you set earlier. For example, to check if MARI_CACHE is set, enter echo %MARI_CACHE%.