How to read two files in shell Script?
Read 2 files line by line alternatively
- The paste command is the easiest of all to read 2 files simultaneously. $ paste -d”\n” file1 file2 Unix AIX Linux HPUX Solaris Cygwin.
- awk option.
- Using paste with awk:
- paste output is piped to the while loop.
- A pure shell solution.
How to read a file in Linux Using while loop?
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.
Is there a while loop to read from input file?
I wrote a function that reads in transactions from an input file using a while loop. I can’t for the life of me figure out why it is reading the last 2 lines twice though. When using from my understanding it will continue looping until the file as reached the EOF marker. I can’t figure out where I am going wrong here.
How to read from two input files using Bash?
Open the two files on different file descriptors. Redirect the input of the read built-in to the descriptor that the file you want is connected to. In bash/ksh/zsh, you can write read -u 3 instead of read <&3. while IFS= read -r lineA && IFS= read -r lineB <&3; do echo “$lineA”; echo “$lineB” done
How to redirect a file to while loop?
You can also use other commands like head, tail, and pipe it to while loop. We can redirect the content of the file to while loop using the Input redirection operator (<). You can also store the file name to a variable and pass it through a redirection operator.
What happens at the end of a for loop?
With the for loop approach, the loop automatically stops when the end of the file is encountered. Or never even iterates once if the file is empty! But what happens if you are at the end of the file when you call read or readline?