我还没有足够的代表来评论或投票他的解决方案，但他的答案对我来说非常有效。我遇到的唯一问题是参数以单引号结尾(所以我把它们去掉了)。

我还添加了一些示例用法和帮助文本。我将在这里附上我略微扩展的版本:

#!/bin/bash

# getopt example
# from: https://stackoverflow.com/questions/402377/using-getopts-in-bash-shell-script-to-get-long-and-short-command-line-options
HELP_TEXT=\
"   USAGE:\n
    Accepts - and -- flags, can specify options that require a value, and can be in any order. A double-hyphen (--) will stop processing options.\n\n

    Accepts the following forms:\n\n

    getopt-example.sh -a -b -c value-for-c some-arg\n
    getopt-example.sh -c value-for-c -a -b some-arg\n
    getopt-example.sh -abc some-arg\n
    getopt-example.sh --along --blong --clong value-for-c -a -b -c some-arg\n
    getopt-example.sh some-arg --clong value-for-c\n
    getopt-example.sh
"

aflag=false
bflag=false
cargument=""

# options may be followed by one colon to indicate they have a required argument
if ! options=$(getopt -o abc:h\? -l along,blong,help,clong: -- "$@")
then
    # something went wrong, getopt will put out an error message for us
    exit 1
fi

set -- $options

while [ $# -gt 0 ]
do
    case $1 in
    -a|--along) aflag=true ;;
    -b|--blong) bflag=true ;;
    # for options with required arguments, an additional shift is required
    -c|--clong) cargument="$2" ; shift;;
    -h|--help|-\?) echo -e $HELP_TEXT; exit;;
    (--) shift; break;;
    (-*) echo "$0: error - unrecognized option $1" 1>&2; exit 1;;
    (*) break;;
    esac
    shift
done

# to remove the single quotes around arguments, pipe the output into:
# | sed -e "s/^'\\|'$//g"  (just leading/trailing) or | sed -e "s/'//g"  (all)

echo aflag=${aflag}
echo bflag=${bflag}
echo cargument=${cargument}

while [ $# -gt 0 ]
do
    echo arg=$1
    shift

    if [[ $aflag == true ]]; then
        echo a is true
    fi

done

看一下shFlags，它是一个可移植的shell库(意思是:sh, bash, dash, ksh, zsh在Linux, Solaris等上)。

它使得添加新标志就像在脚本中添加一行一样简单，并且它提供了一个自动生成的用法函数。

这是一个简单的Hello, world!使用shFlag:

#!/bin/sh

# source shflags from current directory
. ./shflags

# define a 'name' command-line string flag
DEFINE_string 'name' 'world' 'name to say hello to' 'n'

# parse the command-line
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"

# say hello
echo "Hello, ${FLAGS_name}!"

对于具有支持长选项的增强getopt的操作系统(例如Linux)，您可以这样做:

$ ./hello_world.sh --name Kate
Hello, Kate!

对于其他情况，您必须使用短选项:

$ ./hello_world.sh -n Kate
Hello, Kate!

添加一个新标志就像添加一个新的DEFINE_调用一样简单。

在ksh93中，getopts支持长名字…

while getopts "f(file):s(server):" flag
do
    echo "$flag" $OPTIND $OPTARG
done

至少我找到的教程是这么说的。试试看。

Bash内置的getopts函数可以通过在optspec中放入破折号和冒号来解析长选项:

#!/usr/bin/env bash 
optspec=":hv-:"
while getopts "$optspec" optchar; do
    case "${optchar}" in
        -)
            case "${OPTARG}" in
                loglevel)
                    val="${!OPTIND}"; OPTIND=$(( $OPTIND + 1 ))
                    echo "Parsing option: '--${OPTARG}', value: '${val}'" >&2;
                    ;;
                loglevel=*)
                    val=${OPTARG#*=}
                    opt=${OPTARG%=$val}
                    echo "Parsing option: '--${opt}', value: '${val}'" >&2
                    ;;
                *)
                    if [ "$OPTERR" = 1 ] && [ "${optspec:0:1}" != ":" ]; then
                        echo "Unknown option --${OPTARG}" >&2
                    fi
                    ;;
            esac;;
        h)
            echo "usage: $0 [-v] [--loglevel[=]<value>]" >&2
            exit 2
            ;;
        v)
            echo "Parsing option: '-${optchar}'" >&2
            ;;
        *)
            if [ "$OPTERR" != 1 ] || [ "${optspec:0:1}" = ":" ]; then
                echo "Non-option argument: '-${OPTARG}'" >&2
            fi
            ;;
    esac
done

拷贝到当前工作目录中的可执行文件name=getopts_test.sh后，可以生成如下输出

$ ./getopts_test.sh
$ ./getopts_test.sh -f
Non-option argument: '-f'
$ ./getopts_test.sh -h
usage: code/getopts_test.sh [-v] [--loglevel[=]<value>]
$ ./getopts_test.sh --help
$ ./getopts_test.sh -v
Parsing option: '-v'
$ ./getopts_test.sh --very-bad
$ ./getopts_test.sh --loglevel
Parsing option: '--loglevel', value: ''
$ ./getopts_test.sh --loglevel 11
Parsing option: '--loglevel', value: '11'
$ ./getopts_test.sh --loglevel=11
Parsing option: '--loglevel', value: '11'

显然，getopts既不执行OPTERR检查，也不对长选项执行选项参数解析。上面的脚本片段展示了如何手动完成这一工作。基本原理也适用于Debian Almquist shell(“破折号”)。注意特殊情况:

getopts -- "-:"  ## without the option terminator "-- " bash complains about "-:"
getopts "-:"     ## this works in the Debian Almquist shell ("dash")

请注意，正如http://mywiki.wooledge.org/BashFAQ上的GreyCat指出的那样，这个技巧利用了shell的非标准行为，允许选项参数(即“-ffilename”中的文件名)连接到选项(如“-ffilename”)。POSIX标准规定它们之间必须有一个空格，在"——longoption"的情况下，空格将终止选项解析并将所有长选项转换为非选项参数。

如果你不想要getopt依赖，你可以这样做:

while test $# -gt 0
do
  case $1 in

  # Normal option processing
    -h | --help)
      # usage and help
      ;;
    -v | --version)
      # version info
      ;;
  # ...

  # Special cases
    --)
      break
      ;;
    --*)
      # error unknown (long) option $1
      ;;
    -?)
      # error unknown (short) option $1
      ;;

  # FUN STUFF HERE:
  # Split apart combined short options
    -*)
      split=$1
      shift
      set -- $(echo "$split" | cut -c 2- | sed 's/./-& /g') "$@"
      continue
      ;;

  # Done with options
    *)
      break
      ;;
  esac

  # for testing purposes:
  echo "$1"

  shift
done

当然，这样你就不能使用长样式选项。如果你想添加缩短的版本(例如——verbos而不是——verbose)，那么你需要手动添加这些。

但是如果您希望获得getopts功能和长选项，这是一种简单的方法。

我也把这个片段作为一个主旨。

我想要一个没有外部依赖关系、有严格bash支持(-u)的东西，而且我需要它能在较旧的bash版本上工作。这个函数处理各种类型的参数:

短bool (-h) 短选项(-i "image.jpg") 长boos(——救命) = options(——file="filename.ext") 空格选项(——file "filename.ext") 连接的bool (-hvm)

只需在脚本顶部插入以下内容:

# Check if a list of params contains a specific param
# usage: if _param_variant "h|?|help p|path f|file long-thing t|test-thing" "file" ; then ...
# the global variable $key is updated to the long notation (last entry in the pipe delineated list, if applicable)
_param_variant() {
  for param in $1 ; do
    local variants=${param//\|/ }
    for variant in $variants ; do
      if [[ "$variant" = "$2" ]] ; then
        # Update the key to match the long version
        local arr=(${param//\|/ })
        let last=${#arr[@]}-1
        key="${arr[$last]}"
        return 0
      fi
    done
  done
  return 1
}

# Get input parameters in short or long notation, with no dependencies beyond bash
# usage:
#     # First, set your defaults
#     param_help=false
#     param_path="."
#     param_file=false
#     param_image=false
#     param_image_lossy=true
#     # Define allowed parameters
#     allowed_params="h|?|help p|path f|file i|image image-lossy"
#     # Get parameters from the arguments provided
#     _get_params $*
#
# Parameters will be converted into safe variable names like:
#     param_help,
#     param_path,
#     param_file,
#     param_image,
#     param_image_lossy
#
# Parameters without a value like "-h" or "--help" will be treated as
# boolean, and will be set as param_help=true
#
# Parameters can accept values in the various typical ways:
#     -i "path/goes/here"
#     --image "path/goes/here"
#     --image="path/goes/here"
#     --image=path/goes/here
# These would all result in effectively the same thing:
#     param_image="path/goes/here"
#
# Concatinated short parameters (boolean) are also supported
#     -vhm is the same as -v -h -m
_get_params(){

  local param_pair
  local key
  local value
  local shift_count

  while : ; do
    # Ensure we have a valid param. Allows this to work even in -u mode.
    if [[ $# == 0 || -z $1 ]] ; then
      break
    fi

    # Split the argument if it contains "="
    param_pair=(${1//=/ })
    # Remove preceeding dashes
    key="${param_pair[0]#--}"

    # Check for concatinated boolean short parameters.
    local nodash="${key#-}"
    local breakout=false
    if [[ "$nodash" != "$key" && ${#nodash} -gt 1 ]]; then
      # Extrapolate multiple boolean keys in single dash notation. ie. "-vmh" should translate to: "-v -m -h"
      local short_param_count=${#nodash}
      let new_arg_count=$#+$short_param_count-1
      local new_args=""
      # $str_pos is the current position in the short param string $nodash
      for (( str_pos=0; str_pos<new_arg_count; str_pos++ )); do
        # The first character becomes the current key
        if [ $str_pos -eq 0 ] ; then
          key="${nodash:$str_pos:1}"
          breakout=true
        fi
        # $arg_pos is the current position in the constructed arguments list
        let arg_pos=$str_pos+1
        if [ $arg_pos -gt $short_param_count ] ; then
          # handle other arguments
          let orignal_arg_number=$arg_pos-$short_param_count+1
          local new_arg="${!orignal_arg_number}"
        else
          # break out our one argument into new ones
          local new_arg="-${nodash:$str_pos:1}"
        fi
        new_args="$new_args \"$new_arg\""
      done
      # remove the preceding space and set the new arguments
      eval set -- "${new_args# }"
    fi
    if ! $breakout ; then
      key="$nodash"
    fi

    # By default we expect to shift one argument at a time
    shift_count=1
    if [ "${#param_pair[@]}" -gt "1" ] ; then
      # This is a param with equals notation
      value="${param_pair[1]}"
    else
      # This is either a boolean param and there is no value,
      # or the value is the next command line argument
      # Assume the value is a boolean true, unless the next argument is found to be a value.
      value=true
      if [[ $# -gt 1 && -n "$2" ]]; then
        local nodash="${2#-}"
        if [ "$nodash" = "$2" ]; then
          # The next argument has NO preceding dash so it is a value
          value="$2"
          shift_count=2
        fi
      fi
    fi

    # Check that the param being passed is one of the allowed params
    if _param_variant "$allowed_params" "$key" ; then
      # --key-name will now become param_key_name
      eval param_${key//-/_}="$value"
    else
      printf 'WARNING: Unknown option (ignored): %s\n' "$1" >&2
    fi
    shift $shift_count
  done
}

像这样使用它:

# Assign defaults for parameters
param_help=false
param_path=$(pwd)
param_file=false
param_image=true
param_image_lossy=true
param_image_lossy_quality=85

# Define the params we will allow
allowed_params="h|?|help p|path f|file i|image image-lossy image-lossy-quality"

# Get the params from arguments provided
_get_params $*