hannic · March 22, 2023 06:25 · Apr 30, 2020 · Jun 8, 2014 · Jun 8, 2014 · Jun 8, 2014
diff --git a/cheat-sheet-bash.sh b/cheat-sheet-bash.sh
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+!! - Last command
+  !foo - Run most recent command starting with 'foo...' (ex. !ps, !mysqladmin)
+  !foo:p - Print command that !foo would run, and add it as the latest to command history
+  !$ - Last 'word' of last command ('/path/to/file' in the command 'ls -lAFh /path/to/file', '-uroot' in 'mysql -uroot')
+  !$:p - Print word that !$ would substitute
+  !* - All but first word of last command ('-lAFh /path/to/file' in the command 'ls -lAFh /path/to/file', '-uroot' in 'mysql -uroot')
+  !*:p - Print words that !* would substitute
+
+  ^foo^bar - Replace 'foo' in last command with 'bar', print the result, then run. ('mysqladmni -uroot', run '^ni^in', results in 'mysqladmin -uroot')
+
+  {a,b,c} passes words to the command, substituting a, b, and c sequentially (`cp file{,.bk}` runs `cp file file.bk`)
+
+  Ctrl + a - Jump to the start of the line
+  Ctrl + b - Move back a char
+  Ctrl + c - Terminate the command
+  Ctrl + d - Delete from under the cursor
+  Ctrl + e - Jump to the end of the line
+  Ctrl + f - Move forward a char
+  Ctrl + k - Delete to EOL
+  Ctrl + l - Clear the screen
+  Ctrl + r - Search the history backwards
+  Ctrl + R - Search the history backwards with multi occurrence
+  Ctrl + t - Transpose the current char with the previous
+  Ctrl + u - Delete backward from cursor
+  Ctrl + w - Delete backward a word
+  Ctrl + xx - Move between EOL and current cursor position
+  Ctrl + x @ - Show possible hostname completions
+  Ctrl + z - Suspend/ Stop the command
+  Ctrl + x; Ctrl + e - Edit line into your favorite editor
+
+  Alt + < - Move to the first line in the history
+  Alt + > - Move to the last line in the history
+  Alt + ? - Show current completion list
+  Alt + * - Insert all possible completions
+  Alt + / - Attempt to complete filename
+  Alt + . - Yank last argument to previous command
+  Alt + b - Move backward
+  Alt + c - Capitalize the word
+  Alt + d - Delete word
+  Alt + f - Move forward
+  Alt + l - Make word lowercase
+  Alt + n - Search the history forwards non-incremental
+  Alt + p - Search the history backwards non-incremental
+  Alt + r - Recall command
+  Alt + t - Transpose the current word with the previous
+  Alt + u - Make word uppercase
+  Alt + back-space - Delete backward from cursor
+
+  (Here "2T" means Press TAB twice)
+  $ 2T - All available commands(common)
+  $ (string)2T - All available commands starting with (string)
+  $ /2T - Entire directory structure including Hidden one
+  $ (dir)2T - Only Sub Dirs inside (dir) including Hidden one
+  $ *2T - Only Sub Dirs inside without Hidden one 
+  $ ~2T - All Present Users on system from "/etc/passwd"
+  $ $2T - All Sys variables
+  $ @2T - Entries from "/etc/hosts"
+  $ =2T - Output like ls or dir
+  .bash_profile = sourced by login shell, 
+  .bashrc = sourced by all shells, 
+  .bash_aliases = should be sourced by .bashrc
+
+Run something:
+  for i in a b c; do $i 'hello'; done
+
+Do something on a bunch of files:
+  for i in *.rb; do echo "$i"; done
+
+If syntax:
+  if [[ -e .ssh ]]; then echo "hi"; fi
+
+Numerical comparison:
+  i=0; if (( i <= 1 )); then echo "smaller or equal"; else echo "bigger"; fi
+
+file check flags:
+  -e:  file exists
+  -f:  regular file (non directory)
+  -d:  directory
+  -s:  non-zero file
+  -x:  execute permission
+
+Avoid duplicates in your history:
+  export HISTIGNORE="&:ls:ls *:[bf]g:exit"
+
+more here:
+  http://www.linuxtopia.org/online_books/advanced_bash_scripting_guide/fto.html
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