linux-shell-script.md

Shell Script

Return value in bash script

echo 사용 :

function fun1(){
  echo 34
}

function fun2(){
  local res=$(fun1)
  echo $res
}

$(...) captures the text sent to stdout by the command contained within

return 사용 :

function fun1(){
  return 34
}

function fun2(){
  fun1
  local res=$?
  echo $res
}

$? contains the result code of the last command.

AND

if [ "$#" -eq 0 ] || [ "$#" -gt 1 ] ; then
    echo "hello"
fi

Argument

makereport -u jsmith -p notebooks -d 10-20-2011 -f pdf

while getopts u:d:p:f: option
do
case "${option}"
in
u) USER=${OPTARG};;
d) DATE=${OPTARG};;
p) PRODUCT=${OPTARG};;
f) FORMAT=$OPTARG;;
esac
done