1.6 KiB
1.6 KiB
🧾 Linux Exit Codes Cheat Sheet
Every command in Linux returns an exit status code upon completion. You can check this code using:
command
echo $?
These codes are helpful for debugging scripts or understanding command behavior.
✅ Common Exit Codes & Their Meanings
| Exit Code | Meaning |
|---|---|
0 |
✅ Success |
1 |
❌ General Error |
2 |
⚠️ Misuse of Shell Built-in (bad options, etc.) |
126 |
🚫 Command Found but Cannot Execute |
127 |
❓ Command Not Found |
130 |
⌨️ Terminated by Ctrl+C |
137 |
💀 Killed (e.g., kill -9) |
🔍 Exit Code Examples
0 — Success
echo "Hello"
echo $? # ➜ 0
1 — General Error
grep "text" non_existing_file.txt
echo $? # ➜ 1
2 — Misuse of Shell Built-in
ls --wrongoption
echo $? # ➜ 2
126 — Command Found but Not Executable
touch myscript.sh
chmod -x myscript.sh
./myscript.sh
echo $? # ➜ 126
127 — Command Not Found
nonexistentcommand
echo $? # ➜ 127
130 — Script Terminated by Ctrl+C
sleep 10
# Press Ctrl+C while it sleeps
echo $? # ➜ 130
137 — Killed by kill -9
sleep 100 &
kill -9 $!
wait
echo $? # ➜ 137