How to read variables and values from file by Bash?

How to read variables and values from file by Bash?

It’s probably better to split on =, and remove the quotes, so with just the shell: key contains the variable name, val the value. Of course this doesn’t actually parse the input, it just removes the double quotes if they happen to be there. That uses the bash builtin mapfile command and a process substitition.

How to read a variable from a file?

As Radu Rădeanu has already suggested, you could use cat inside your script to read the contents of a file into a avariable – in that case, you need each file to contain only one line, with only the value you want for that specific variable.

When to use invoking Cat in bash or zsh?

In bash or zsh, to read a whole file into a variable without invoking cat: Invoking cat in bash or zsh to slurp a file would be considered a Useless Use of Cat. Note that it is not necessary to quote the command substitution to preserve newlines. See: Bash Hacker’s Wiki – Command substitution – Specialities.

Can you use cat to slurp a file in Bash?

Invoking cat in bash or zsh to slurp a file would be considered a Useless Use of Cat. Note that it is not necessary to quote the command substitution to preserve newlines.

Is there an easy way to read a file into a variable?

Is there an easy way to do this? In bash or zsh, to read a whole file into a variable without invoking cat: Invoking cat in bash or zsh to slurp a file would be considered a Useless Use of Cat. Note that it is not necessary to quote the command substitution to preserve newlines.

How to read line by line in Bash?

ProcessText1 needs to call ProcessLine at two places, which might be uncomfortable if you would like to place a block of code there which directly processes the line, instead of calling a function which processes the line; you would have to repeat the code which is error-prone.

How to Pip into a while Read loop in Bash?

piping into a while read loop in bash means the while loop is in a subshell, so variables aren’t global. while read;do ;done <<< “$var” makes the loop body not a subshell.