BASH-CHEAT-SHEET-IMP.txt

https://devhints.io/bash

https://www.cyberciti.biz/tips/bash-shell-parameter-substitution-2.html -> IMP

https://yeonghoey.com/unix-like/expansions/

https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html

https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_73/rzahz/rzahzparamexp.htm

http://ngelinux.com/brief-explanation-string-and-array-slicing-in-bash-shell-linux/ --> BASH string slicinig

https://zwischenzugs.com/2018/10/12/eleven-bash-tips-you-might-want-to-know/ 

https://linuxconfig.org/bash-scripting-tutorial

https://www.shellscript.sh/tips/pattern-substitution/

https://spin.atomicobject.com/2014/02/16/bash-string-maniuplation/

https://tiswww.case.edu/php/chet/bash/bashref.html

https://developpaper.com/examples-of-the-meaning-and-use-of-set-and-shopt-command-options-in-the-shell/

http://matt.might.net/articles/bash-by-example/

http://redsymbol.net/articles/unofficial-bash-strict-mode/


Expression         Result                                Comments
${path##/*/}                      long.file.name   ## takes out longest matched substring from the front
${path#/*/}              cam/book/long.file.name   # takes out shortest matched substring from the front
$path              /home/cam/book/long.file.name   
${path%.*}         /home/cam/book/long.file        % takes out shortest matched substring from the rear
${path%%.*}        /home/cam/book/long             %% takes out longest matched substring from the rear


var=/Users/karlin/git/langton_loops/index.html.erb
echo ${var}         # => /Users/karlin/git/langton_loops/index.html.erb
echo ${var#*.}      # => html.erb
echo ${var##*.}     # => erb
echo ${var%/*.*}    # => /Users/karlin/git/langton_loops
 
file=${var##/*/}    # => index.html.erb
echo ${file%.*}     # => index.html
echo ${file%%.*}    # => index