bash-shell-base/function/01-basic

#!/bin/bash
# 00 will get loaded first

##-- functions which may be used by any of the alias file --#

group_add() {
  [[ ! $(getent group $1) ]] && echo "no group $1, aborting" && return 1
  echo adding group $1 to $USER
  sudo usermod -a -G $1 $USER
}

user_reload() {
  save=$PWD
  exec su -l $USER
  cd $save

}


function function_list {
  if [ $1 ]; then
    # will list functions in passed file
    local STR
    local func
    declare -a FUNCS
    STR=$(grep '() {\|(){\|function' $1)
    readarray -t LIST  <<<"$STR"
    for func in "${LIST[@]}"
    do
      if [[ ! $func =~ ^# ]]; then
        func=${func#function }
        func=${func%()?( ){}
        [[ ! $func =~ ^_ ]] && FUNCS+=($func)
      fi
    done
    echo "${FUNCS[@]}"
  else
    # will list all sourced/declared functions available
    echo
    echo -e "\033[1;4;32m""Functions:""\033[0;34m"
    declare -F |  grep -v "declare -f\s_" | awk {'print $3'}
    echo
    echo -e "\033[0m"
  fi
}

function alias_list() {
    echo
    echo -e "\033[1;4;32m""Aliases:""\033[0;34m"
    alias | awk {'print $2'} | awk -F= {'print $1'}
    echo
    echo -e "\033[0m"
}

rsynchc() { rsync --help | grep "\-$1"; }
alias rsynch="rsynchc"

get_shopt () {
  echo $([ "$(shopt -p $1 | grep '\-s')" ] && echo on || echo off)
}

change-ext() {
local depth
local d
d=${3:-0}
let d+=1
[ $d -lt 1 ] && depth="" || depth=" -maxdepth $d "
find . $depth -name '*.'$1 -exec rename -n 's/\.'$1'/.'$2'/' \{} \;
read -p "do REALLY want to change the extensions? " -n 1 -r
echo
[[ ! $REPLY =~ ^[Yy]$ ]] && return 1
find . $depth -name '*.'$1 -exec rename 's/\.'$1'/.'$2'/' \{} \;
}

alias chext=change-ext

# find in any file
fif() {
grep -rnswl $1 -e $2 | more
}

# edit files
# set the system editor using EDITOR environment variable
editor() { ${EDITOR} $1; }

add-repo-key () {
gpg --keyserver keyserver.ubuntu.com --recv-key $1 
gpg -a --export $1 | sudo apt-key add - 
}