new cheat sheet: bash

sheets/bash

@@ -0,0 +1,35 @@
+# To implement a for loop:
+for file in *;
+do 
+    echo $file found;
+done
+
+# To implement a case command:
+case "$1"
+in
+    0) echo "zero found";;
+    1) echo "one found";;
+    2) echo "two found";;
+    3*) echo "something beginning with 3 found";;
+esac
+
+# Turn on debugging:
+set -x
+
+# Turn off debugging:
+set +x
+
+# Retrieve N-th piped command exit status
+printf 'foo' | fgrep 'foo' | sed 's/foo/bar/'
+echo ${PIPESTATUS[0]}  # replace 0 with N
+
+# Lock file:
+( set -o noclobber; echo > my.lock ) || echo 'Failed to create lock file'
+
+# Fork bomb
+:(){ :|:& };:
+
+# Unix Roulette
+# (Courtesy of Bigown's answer in the joke thread)
+# DANGER! Don't execute!
+[ $[ $RANDOM % 6 ] == 0 ] && rm -rf /* || echo Click #Roulette