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How do I read a text file line by line in bash?
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 do I read a single line in bash?
In Bash, you can use a while loop on the command line to read each line of text from a file and do something with it. Our text file is called “data. txt.” It holds a list of the months of the year. The while loop reads a line from the file, and the execution flow of the little program passes to the body of the loop.
How to read file line by line in bash script?
If you want to read each line of a file by omitting backslash escape then you have to use ‘-r’ option with read command in while loop. Create a file named company2.txt with backslash and run the following command to execute the script. The output will show the file content without any backslash.
How to change the file descriptor in Bash?
A very simple and robust workaround is to change the file descriptor from which the read command receives input. This is accomplished by two modifications: the -u argument to read, and the redirection operator for < $FILENAME. In BASH, the default file descriptor values (i.e. values for -u in read) are:
Why do I only see the first line in do _ work.sh?
In do_work.sh, I run a couple of ssh commands. The problem is that do_work.sh runs ssh commands and by default ssh reads from stdin which is your input file. As a result, you only see the first line processed, because ssh consumes the rest of the file and your while loop terminates.
How to run bash script with employee.txt file?
Run the above script with employee.txt file as argument value. The output will show the content of employee.txt file by removing extra space. You can show the original content of employee.txt file by using ‘cat’ command.