How do I read multiple files in a bash script?

How do I read multiple files in a bash script?

Reading Multiple Files with Bash

1. exec 7
2. read data1 <&7 read data2 <&8.
3. exec 7

How do I view multiple files in Linux?

If you have for example /var/log/syslog , /var/log/auth. log log files, you can view them both in one terminal by executing tail -f command . Usage: multitail . So the output will be part of file1 and part of file2 in the same terminal.

How do I read one line at a time 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 many files are in a directory bash?

To determine how many files there are in the current directory, put in ls -1 | wc -l. This uses wc to do a count of the number of lines (-l) in the output of ls -1.

How do you loop through a file in Unix?

To loop through a directory, and then print the name of the file, execute the following command: for FILE in *; do echo $FILE; done….Now use the touch command to create a few text files:

1. touch file-1. txt.
2. touch file-2. txt.
3. touch file-3. txt.
4. touch file-4. txt.
5. touch file-5. txt.

How do I list multiple files in Unix?

List the files in a directory in Unix

1. You can limit the files that are described by using fragments of filenames and wildcards.
2. If you would like to list files in another directory, use the ls command along with the path to the directory.
3. Several options control the way in which the information you get is displayed.

Is it possible to read multiple files in Bash?

Reading Multiple Files with Bash. Reading files is no big deal with bash: you just redirect the input to the script or pipe the output of another command into the script, or you could do it inside the script if the file names are pre-determined.

How to loop through multiple files in bash script?

I have 2 files generated in linux that has common output and were produced across multiple hosts with the same setup/configs. These files do some simple reporting on resource allocation and user sessions. So, essentially, say, 10 hosts, with the same (2) system reporting in the files, so a…

Is there a way to read files from the command line?

You could also use process substitution to pass in the open files (command pipelines actually) from the command line. Another option, the one I describe here, is to just open the files and read (or write) them as you like, as you’d do in other programming languages.

What are all the file descriptors in Bash?

File descriptors number 0, 1, and 2 are already used for stdin, stdout, and stderr, respectively. File descriptors from 3 and up are (usually) free. The bash manual warns from using file descriptors greater than 9, because they are “used internally”.