How do I read a text variable in bash?

How do I read a text variable in bash?

Reading File Content Using Script

1. #!/bin/bash.
2. file=’read_file.txt’
3. i=1.
4. while read line; do.
5. #Reading each line.
6. echo “Line No. $ i : $line”
7. i=$((i+1))
8. done < $file.

How do I read a text file in shell?

How to Read a File Line By Line in Bash. The input file ( $input ) is the name of the file you need use by the read command. The read command reads the file line by line, assigning each line to the $line bash shell variable. Once all lines are read from the file the bash while loop will stop.

How to read a file into a variable in Bash?

In cross-platform, lowest-common-denominator sh you use: 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.

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.

What’s the default input descriptor for Bash read?

Based on the accepted answer and on the bash-hackers redirection tutorial. Here, we open the file descriptor 3 for the file passed as the script argument and tell read to use this descriptor as input ( -u 3 ). Thus, we leave the default input descriptor (0) attached to a terminal or another input source, able to read user input.

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.