shellscript

if ! [ -x "$(command -v git)" ]; then
  echo "Error: $cmd is not installed." >&2
  exit 1
fi

tmp=/a/b/c/
echo ${tmp%/}

f() {
  # use `echo` like return
  echo "$1 $2"
}

a=$(f hello sh)

echo $a

a="hello-world"

if [[ $a =~ "-" ]]; then
  echo "a contains '-'"
fi

path=/a/b/c/d.txt
nameWithSuffix="${path##*/}"
echo "with suffix:\t$nameWithSuffix"
nameWithoutSuffix="${nameWithSuffix%.*}"
echo "without suffix:\t$nameWithoutSuffix"

if [ ! -f "/a/b/c/a" ]; then
  echo "File doesn't exist."
fi