LeCoupa · October 23, 2025 20:35 · Nov 11, 2017 · Nov 9, 2017 · Nov 5, 2014 · Nov 5, 2014
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -36,8 +36,8 @@ CTRL+V  # makes the next character typed verbatim
 CTRL+W  # kills the word behind the cursor
 CTRL+X  # lists the possible filename completefions of the current word
 CTRL+Y  # retrieves (yank) last item killed
+CTRL+Z  # stops the current command, resume with fg in the foreground or bg in the background
 
-CTRL+z  # stops the current command, resume with fg in the foreground or bg in the background
 DELETE  # deletes one character backward
 !!      # repeats the last command
 exit    # logs out of current session

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -17,18 +17,28 @@
 CTRL+A  # move to beginning of line
 CTRL+B  # moves backward one character
 CTRL+C  # halts the current command
-CTRL+D  # deletes one character backward
+CTRL+D  # deletes one character backward or logs out of current session, similar to exit
 CTRL+E  # moves to end of line
 CTRL+F  # moves forward one character
 CTRL+G  # aborts the current editing command and ring the terminal bell
 CTRL+J  # same as RETURN
 CTRL+K  # deletes (kill) forward to end of line
 CTRL+L  # clears screen and redisplay the line
-
-ctrl+z  # stops the current command, resume with fg in the foreground or bg in the background
-ctrl+d  # logs out of current session, similar to exit
-ctrl+w  # erases one word in the current line
-ctrl+u  # erases the whole  line
+CTRL+M  # same as RETURN
+CTRL+N  # next line in command history
+CTRL+O  # same as RETURN, then displays next line in history file
+CTRL+P  # previous line in command history
+CTRL+R  # searches backward
+CTRL+S  # searches forward
+CTRL+T  # transposes two characters
+CTRL+U  # kills backward from point to the beginning of line
+CTRL+V  # makes the next character typed verbatim
+CTRL+W  # kills the word behind the cursor
+CTRL+X  # lists the possible filename completefions of the current word
+CTRL+Y  # retrieves (yank) last item killed
+
+CTRL+z  # stops the current command, resume with fg in the foreground or bg in the background
+DELETE  # deletes one character backward
 !!      # repeats the last command
 exit    # logs out of current session
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -18,6 +18,12 @@ CTRL+A  # move to beginning of line
 CTRL+B  # moves backward one character
 CTRL+C  # halts the current command
 CTRL+D  # deletes one character backward
+CTRL+E  # moves to end of line
+CTRL+F  # moves forward one character
+CTRL+G  # aborts the current editing command and ring the terminal bell
+CTRL+J  # same as RETURN
+CTRL+K  # deletes (kill) forward to end of line
+CTRL+L  # clears screen and redisplay the line
 
 ctrl+z  # stops the current command, resume with fg in the foreground or bg in the background
 ctrl+d  # logs out of current session, similar to exit

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -11,6 +11,22 @@
 #####################################################
 
 
+# 0. Shortcuts.
+
+
+CTRL+A  # move to beginning of line
+CTRL+B  # moves backward one character
+CTRL+C  # halts the current command
+CTRL+D  # deletes one character backward
+
+ctrl+z  # stops the current command, resume with fg in the foreground or bg in the background
+ctrl+d  # logs out of current session, similar to exit
+ctrl+w  # erases one word in the current line
+ctrl+u  # erases the whole  line
+!!      # repeats the last command
+exit    # logs out of current session
+
+
 # 1. Bash Basics.
 
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -374,17 +374,3 @@ function returntrap {
 
 trap returntrap RETURN  # is executed each time a shell function or a script executed with the . or source commands finishes executing
 
-
-# 8. Shortcuts.
-
-CTRL+A  # move to beginning of line
-CTRL+B  # moves backward one character
-CTRL+C  # halts the current command
-CTRL+D  # deletes one character backward
-
-ctrl+z  # stops the current command, resume with fg in the foreground or bg in the background
-ctrl+d  # logs out of current session, similar to exit
-ctrl+w  # erases one word in the current line
-ctrl+u  # erases the whole  line
-!!      # repeats the last command
-exit    # logs out of current session
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -100,18 +100,6 @@ dig -x <host>            # reverses lookup host
 wget <file>              # downloads file
 
 
-# 1.4. Shortcuts.
-
-
-ctrl+c  # halts the current command
-ctrl+z  # stops the current command, resume with fg in the foreground or bg in the background
-ctrl+d  # logs out of current session, similar to exit
-ctrl+w  # erases one word in the current line
-ctrl+u  # erases the whole  line
-!!      # repeats the last command
-exit    # logs out of current session
-
-
 # 2. Basic Shell Programming.
 
 
@@ -386,3 +374,17 @@ function returntrap {
 
 trap returntrap RETURN  # is executed each time a shell function or a script executed with the . or source commands finishes executing
 
+
+# 8. Shortcuts.
+
+CTRL+A  # move to beginning of line
+CTRL+B  # moves backward one character
+CTRL+C  # halts the current command
+CTRL+D  # deletes one character backward
+
+ctrl+z  # stops the current command, resume with fg in the foreground or bg in the background
+ctrl+d  # logs out of current session, similar to exit
+ctrl+w  # erases one word in the current line
+ctrl+u  # erases the whole  line
+!!      # repeats the last command
+exit    # logs out of current session
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -169,7 +169,7 @@ $(UNIX command)              # command substitution: runs the command and return
 
 # 2.2. Functions.
 # The function refers to passed arguments by position (as if they were positional parameters), that is, $1, $2, and so forth.
-# $@ is equal to "$1" "$2"... "$N", where N is the number of positional paramaters. $# holds the number of positional parameters.
+# $@ is equal to "$1" "$2"... "$N", where N is the number of positional parameters. $# holds the number of positional parameters.
 
 
 functname() {

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -2,7 +2,7 @@
 #####################################################
 # Name: Bash CheatSheet for Mac OSX
 # 
-# A little overlook of all the things you can do
+# A little overlook of the Bash basics
 #
 # Usage:
 #

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -1,5 +1,14 @@
-# Bash CheatSheet for Mac OSX
-# http://www.gnu.org/software/bash/manual/bashref.html
+#!/bin/bash
+#####################################################
+# Name: Bash CheatSheet for Mac OSX
+# 
+# A little overlook of all the things you can do
+#
+# Usage:
+#
+# Author: J. Le Coupanec
+# Date: 2014/11/04
+#####################################################
 
 
 # 1. Bash Basics.

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -112,7 +112,7 @@ exit    # logs out of current session
 varname=value                # defines a variable
 varname=value command        # defines a variable to be in the environment of a particular subprocess
 echo $varname                # checks a variable's value
-echp $$                      # prints process ID of the current shell
+echo $$                      # prints process ID of the current shell
 echo $!                      # prints process ID of the most recently invoked background job
 echo $?                      # displays the exit status of the last command
 export VARNAME=value         # defines an environment variable (will be available in subprocesses)

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -370,3 +370,10 @@ function dbgtrap {
 trap dbgtrap DEBUG  # causes the trap code to be executed before every statement in a function or script
 # ...section of code in which the problem occurs...
 trap - DEBUG  # turn off the DEBUG trap
+
+function returntrap {
+  echo "A return occured"
+}
+
+trap returntrap RETURN  # is executed each time a shell function or a script executed with the . or source commands finishes executing
+
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -362,3 +362,11 @@ function errtrap {
 }
 
 trap 'errtrap $LINENO' ERR  # is run whenever a command in the surrounding script or function exists with non-zero status 
+
+function dbgtrap {
+  echo "badvar is $badvar"
+}
+
+trap dbgtrap DEBUG  # causes the trap code to be executed before every statement in a function or script
+# ...section of code in which the problem occurs...
+trap - DEBUG  # turn off the DEBUG trap
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -356,7 +356,6 @@ set -o xtrace       # alternative (set option in script)
 
 trap 'echo $varname' EXIT  # useful when you want to print out the values of variables at the point that your script exits
 
-
 function errtrap {
   es=$?
   echo "ERROR line $1: Command exited with status $es."

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -355,3 +355,11 @@ bash -x scriptname  # echo commands after command-line processing
 set -o xtrace       # alternative (set option in script)
 
 trap 'echo $varname' EXIT  # useful when you want to print out the values of variables at the point that your script exits
+
+
+function errtrap {
+  es=$?
+  echo "ERROR line $1: Command exited with status $es."
+}
+
+trap 'errtrap $LINENO' ERR  # is run whenever a command in the surrounding script or function exists with non-zero status 
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -354,4 +354,4 @@ set -o verbose      # alternative (set option in script)
 bash -x scriptname  # echo commands after command-line processing
 set -o xtrace       # alternative (set option in script)
 
-trap 'echo $varname' EXIT  # useful when you want to print out the values of variable at the point that your script exits
+trap 'echo $varname' EXIT  # useful when you want to print out the values of variables at the point that your script exits
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -354,3 +354,4 @@ set -o verbose      # alternative (set option in script)
 bash -x scriptname  # echo commands after command-line processing
 set -o xtrace       # alternative (set option in script)
 
+trap 'echo $varname' EXIT  # useful when you want to print out the values of variable at the point that your script exits
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -340,3 +340,17 @@ cd; nano .bashrc
 
 source .bashrc
 cd websites
+
+
+# 7. Debugging Shell Programs.
+
+
+bash -n scriptname  # don't run commands; check for syntax errors only
+set -o noexec       # alternative (set option in script)
+
+bash -v scriptname  # echo commands before running them
+set -o verbose      # alternative (set option in script)
+
+bash -x scriptname  # echo commands after command-line processing
+set -o xtrace       # alternative (set option in script)
+
diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -323,6 +323,8 @@ trap - sig1 sig2    # resets the action taken when the signal is received to the
 
 disown <PID|JID>    # removes the process from the list of jobs
 
+wait                # waits until all background jobs have finished
+
 
 # 6. Tips and Tricks.
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -319,6 +319,7 @@ ps -a        # selects all processes with a tty except session leaders
 
 trap cmd sig1 sig2  # executes a command when a signal is received by the script
 trap "" sig1 sig2   # ignores that signals
+trap - sig1 sig2    # resets the action taken when the signal is received to the default
 
 disown <PID|JID>    # removes the process from the list of jobs
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -322,6 +322,7 @@ trap "" sig1 sig2   # ignores that signals
 
 disown <PID|JID>    # removes the process from the list of jobs
 
+
 # 6. Tips and Tricks.
 
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -320,6 +320,7 @@ ps -a        # selects all processes with a tty except session leaders
 trap cmd sig1 sig2  # executes a command when a signal is received by the script
 trap "" sig1 sig2   # ignores that signals
 
+disown <PID|JID>    # removes the process from the list of jobs
 
 # 6. Tips and Tricks.
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -318,6 +318,7 @@ ps           # prints a line of information about the current running login shel
 ps -a        # selects all processes with a tty except session leaders
 
 trap cmd sig1 sig2  # executes a command when a signal is received by the script
+trap "" sig1 sig2   # ignores that signals
 
 
 # 6. Tips and Tricks.

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -112,6 +112,8 @@ exit    # logs out of current session
 varname=value                # defines a variable
 varname=value command        # defines a variable to be in the environment of a particular subprocess
 echo $varname                # checks a variable's value
+echp $$                      # prints process ID of the current shell
+echo $!                      # prints process ID of the most recently invoked background job
 echo $?                      # displays the exit status of the last command
 export VARNAME=value         # defines an environment variable (will be available in subprocesses)
 
@@ -298,7 +300,6 @@ n<&-       # closes the input from file descripor n
 # This is slightly different from CTRL+Z in that the process is only stopped when it attempts to read input from terminal.
 # Of course, to interupt a job, type CTRL+C.
 
-
 myCommand &  # runs job in the background and prompts back the shell
 
 jobs         # lists all jobs (use with -l to see associated PID)

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -316,6 +316,8 @@ kill PID     # terminates process with specified PID
 ps           # prints a line of information about the current running login shell and any processes running under it
 ps -a        # selects all processes with a tty except session leaders
 
+trap cmd sig1 sig2  # executes a command when a signal is received by the script
+
 
 # 6. Tips and Tricks.
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -13,6 +13,8 @@ echo $BASH_VERSION  # displays bash version
 bash                # if you want to use bash (type exit to go back to your normal shell)
 whereis bash        # finds out where bash is on your system
 
+clear               # clears content on window (hide displayed lines)
+
 
 # 1.1. File Commands.
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -312,6 +312,7 @@ kill -l      # returns a list of all signals on the system, by name and number
 kill PID     # terminates process with specified PID
 
 ps           # prints a line of information about the current running login shell and any processes running under it
+ps -a        # selects all processes with a tty except session leaders
 
 
 # 6. Tips and Tricks.

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -311,6 +311,8 @@ fg %?string  # brings job whose command contains string
 kill -l      # returns a list of all signals on the system, by name and number
 kill PID     # terminates process with specified PID
 
+ps           # prints a line of information about the current running login shell and any processes running under it
+
 
 # 6. Tips and Tricks.
 

diff --git a/bash-cheatsheet.sh b/bash-cheatsheet.sh
@@ -299,7 +299,7 @@ n<&-       # closes the input from file descripor n
 
 myCommand &  # runs job in the background and prompts back the shell
 
-jobs       # lists all jobs (use with -l to see associated PID)
+jobs         # lists all jobs (use with -l to see associated PID)
 
 fg           # brings a background job into the foreground
 fg %+        # brings most recently invoked background job
@@ -308,7 +308,8 @@ fg %N        # brings job number N
 fg %string   # brings job whose command begins with string
 fg %?string  # brings job whose command contains string
 
-
+kill -l      # returns a list of all signals on the system, by name and number
+kill PID     # terminates process with specified PID
 
 
 # 6. Tips and Tricks.
Original file line number	Diff line number	Diff line change
		@@ -322,6 +322,7 @@ trap "" sig1 sig2 # ignores that signals

		disown <PID\|JID> # removes the process from the list of jobs


		# 6. Tips and Tricks.