IntroToLinux

8. ℹ️ Advanced Pipe Concepts

Named Pipes (FIFOs):

# Create named pipe
mkfifo mypipe

# Use named pipe (in two terminals)
# Terminal 1: echo "Hello" > mypipe
# Terminal 2: cat < mypipe

Process Substitution:

# Compare output of two commands
diff <(ls /bin) <(ls /usr/bin)

# Use command output as file input
sort <(cat file1.txt file2.txt)

Pipeline Exit Status:

# Check exit status of pipeline
command1 | command2
echo $?  # Exit status of command2

# Check all commands in pipeline (bash)
set -o pipefail
command1 | command2
echo ${PIPESTATUS[@]}  # Exit status of all commands

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