shell命令返回值判断的方法实现

if command; then
    echo notify user OK >&2
else
    echo notify user FAIL >&2
    return -1
fi

check() {
    local command=("$@")

    if "${command[@]}"; then
        echo notify user OK >&2
    else
        echo notify user FAIL >&2
        exit 1
    fi
}

check command1
check command2
check command3

installed () {
        command -v "$1" >/dev/null 2>&1
}
if installed <command1>
then
       <command1>  xx
else
        <command1>  xxx
 fi

command1 || exit
command2 || exit
command3 || exit

$  bash -e xx.sh
#!/bin/bash -e xx.sh
command1
command2
command3

$ bash xx.sh 
#!/bin/bash
set -e 
command1
command2
command3

if do some command; then
    echo notify user OK
else
    echo notify user fail
    exit 255  # exit code must be unsigned short
fi

do some command
if [ $? -eq 0 ]; then
    echo notify user OK
else
    echo notify user FAIL
    return -1
fi

die() {
    local message=$1

    echo "$message" >&2
    exit 1
}

command1 || die 'command1 failed'
command2 || die 'command2 failed'
command3 || die 'command3 failed'

warn () {
  echo "$@" >&2
}

die () {
  status="$1"
  shift
  warn "$@"
  exit "$status"
}

do some command && echo notify user OK || die 255 Notify user fail