Assigns the file descriptor (fd) to file for input
To assign a file descriptor to an input file use the following syntax:
exec fd< input.txt
- where, fd >= 3.
Create a shell script called fdread.sh:
#!/bin/bash # Let us assign the file descriptor to file for input # fd # 3 is Input file exec 3< /etc/resolv.conf # Executes cat commands and read input from # the file descriptor (fd) # 3 i.e. read input from /etc/resolv.conf file cat <&3 # Close fd # 3 exec 3<&-
Save and close the file. Run it as follows:
chmod +x fdread.sh ./fdread.sh