我希望使用shell脚本调用长形式和短形式的命令行选项。
我知道可以使用getopts,但是像在Perl中一样,我不能用shell做同样的事情。
关于如何做到这一点的任何想法,这样我就可以使用如下选项:
./shell.sh --copyfile abc.pl /tmp/
./shell.sh -c abc.pl /tmp/
在上面,这两个命令对我的shell意味着同样的事情,但使用getopts,我还不能实现这些?
我希望使用shell脚本调用长形式和短形式的命令行选项。
我知道可以使用getopts,但是像在Perl中一样,我不能用shell做同样的事情。
关于如何做到这一点的任何想法,这样我就可以使用如下选项:
./shell.sh --copyfile abc.pl /tmp/
./shell.sh -c abc.pl /tmp/
在上面,这两个命令对我的shell意味着同样的事情,但使用getopts,我还不能实现这些?
当前回答
例如,如果所有长选项都有唯一且匹配的首字符作为短选项
./slamm --chaos 23 --plenty test -quiet
和
./slamm -c 23 -p test -q
你可以在getopts重写$args之前使用它:
# change long options to short options
for arg; do
[[ "${arg:0:1}" == "-" ]] && delim="" || delim="\""
if [ "${arg:0:2}" == "--" ];
then args="${args} -${arg:2:1}"
else args="${args} ${delim}${arg}${delim}"
fi
done
# reset the incoming args
eval set -- $args
# proceed as usual
while getopts ":b:la:h" OPTION; do
.....
谢谢mtvee的灵感;-)
其他回答
下面是一个实际使用长选项的getopt的示例:
aflag=no
bflag=no
cargument=none
# options may be followed by one colon to indicate they have a required argument
if ! options=$(getopt -o abc: -l along,blong,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="yes" ;;
-b|--blong) bflag="yes" ;;
# for options with required arguments, an additional shift is required
-c|--clong) cargument="$2" ; shift;;
(--) shift; break;;
(-*) echo "$0: error - unrecognized option $1" 1>&2; exit 1;;
(*) break;;
esac
shift
done
为了保持跨平台兼容性,避免依赖外部可执行文件,我从另一种语言移植了一些代码。
我发现它很容易使用,这里有一个例子:
ArgParser::addArg "[h]elp" false "This list"
ArgParser::addArg "[q]uiet" false "Supress output"
ArgParser::addArg "[s]leep" 1 "Seconds to sleep"
ArgParser::addArg "v" 1 "Verbose mode"
ArgParser::parse "$@"
ArgParser::isset help && ArgParser::showArgs
ArgParser::isset "quiet" \
&& echo "Quiet!" \
|| echo "Noisy!"
local __sleep
ArgParser::tryAndGetArg sleep into __sleep \
&& echo "Sleep for $__sleep seconds" \
|| echo "No value passed for sleep"
# This way is often more convienient, but is a little slower
echo "Sleep set to: $( ArgParser::getArg sleep )"
所需的BASH有点长,但我希望避免依赖BASH 4的关联数组。你也可以直接从http://nt4.com/bash/argparser.inc.sh下载
#!/usr/bin/env bash
# Updates to this script may be found at
# http://nt4.com/bash/argparser.inc.sh
# Example of runtime usage:
# mnc.sh --nc -q Caprica.S0*mkv *.avi *.mp3 --more-options here --host centos8.host.com
# Example of use in script (see bottom)
# Just include this file in yours, or use
# source argparser.inc.sh
unset EXPLODED
declare -a EXPLODED
function explode
{
local c=$#
(( c < 2 )) &&
{
echo function "$0" is missing parameters
return 1
}
local delimiter="$1"
local string="$2"
local limit=${3-99}
local tmp_delim=$'\x07'
local delin=${string//$delimiter/$tmp_delim}
local oldifs="$IFS"
IFS="$tmp_delim"
EXPLODED=($delin)
IFS="$oldifs"
}
# See: http://fvue.nl/wiki/Bash:_Passing_variables_by_reference
# Usage: local "$1" && upvar $1 "value(s)"
upvar() {
if unset -v "$1"; then # Unset & validate varname
if (( $# == 2 )); then
eval $1=\"\$2\" # Return single value
else
eval $1=\(\"\${@:2}\"\) # Return array
fi
fi
}
function decho
{
:
}
function ArgParser::check
{
__args=${#__argparser__arglist[@]}
for (( i=0; i<__args; i++ ))
do
matched=0
explode "|" "${__argparser__arglist[$i]}"
if [ "${#1}" -eq 1 ]
then
if [ "${1}" == "${EXPLODED[0]}" ]
then
decho "Matched $1 with ${EXPLODED[0]}"
matched=1
break
fi
else
if [ "${1}" == "${EXPLODED[1]}" ]
then
decho "Matched $1 with ${EXPLODED[1]}"
matched=1
break
fi
fi
done
(( matched == 0 )) && return 2
# decho "Key $key has default argument of ${EXPLODED[3]}"
if [ "${EXPLODED[3]}" == "false" ]
then
return 0
else
return 1
fi
}
function ArgParser::set
{
key=$3
value="${1:-true}"
declare -g __argpassed__$key="$value"
}
function ArgParser::parse
{
unset __argparser__argv
__argparser__argv=()
# echo parsing: "$@"
while [ -n "$1" ]
do
# echo "Processing $1"
if [ "${1:0:2}" == '--' ]
then
key=${1:2}
value=$2
elif [ "${1:0:1}" == '-' ]
then
key=${1:1} # Strip off leading -
value=$2
else
decho "Not argument or option: '$1'" >& 2
__argparser__argv+=( "$1" )
shift
continue
fi
# parameter=${tmp%%=*} # Extract name.
# value=${tmp##*=} # Extract value.
decho "Key: '$key', value: '$value'"
# eval $parameter=$value
ArgParser::check $key
el=$?
# echo "Check returned $el for $key"
[ $el -eq 2 ] && decho "No match for option '$1'" >&2 # && __argparser__argv+=( "$1" )
[ $el -eq 0 ] && decho "Matched option '${EXPLODED[2]}' with no arguments" >&2 && ArgParser::set true "${EXPLODED[@]}"
[ $el -eq 1 ] && decho "Matched option '${EXPLODED[2]}' with an argument of '$2'" >&2 && ArgParser::set "$2" "${EXPLODED[@]}" && shift
shift
done
}
function ArgParser::isset
{
declare -p "__argpassed__$1" > /dev/null 2>&1 && return 0
return 1
}
function ArgParser::getArg
{
# This one would be a bit silly, since we can only return non-integer arguments ineffeciently
varname="__argpassed__$1"
echo "${!varname}"
}
##
# usage: tryAndGetArg <argname> into <varname>
# returns: 0 on success, 1 on failure
function ArgParser::tryAndGetArg
{
local __varname="__argpassed__$1"
local __value="${!__varname}"
test -z "$__value" && return 1
local "$3" && upvar $3 "$__value"
return 0
}
function ArgParser::__construct
{
unset __argparser__arglist
# declare -a __argparser__arglist
}
##
# @brief add command line argument
# @param 1 short and/or long, eg: [s]hort
# @param 2 default value
# @param 3 description
##
function ArgParser::addArg
{
# check for short arg within long arg
if [[ "$1" =~ \[(.)\] ]]
then
short=${BASH_REMATCH[1]}
long=${1/\[$short\]/$short}
else
long=$1
fi
if [ "${#long}" -eq 1 ]
then
short=$long
long=''
fi
decho short: "$short"
decho long: "$long"
__argparser__arglist+=("$short|$long|$1|$2|$3")
}
##
# @brief show available command line arguments
##
function ArgParser::showArgs
{
# declare -p | grep argparser
printf "Usage: %s [OPTION...]\n\n" "$( basename "${BASH_SOURCE[0]}" )"
printf "Defaults for the options are specified in brackets.\n\n";
__args=${#__argparser__arglist[@]}
for (( i=0; i<__args; i++ ))
do
local shortname=
local fullname=
local default=
local description=
local comma=
explode "|" "${__argparser__arglist[$i]}"
shortname="${EXPLODED[0]:+-${EXPLODED[0]}}" # String Substitution Guide:
fullname="${EXPLODED[1]:+--${EXPLODED[1]}}" # http://tldp.org/LDP/abs/html/parameter-substitution.html
test -n "$shortname" \
&& test -n "$fullname" \
&& comma=","
default="${EXPLODED[3]}"
case $default in
false )
default=
;;
"" )
default=
;;
* )
default="[$default]"
esac
description="${EXPLODED[4]}"
printf " %2s%1s %-19s %s %s\n" "$shortname" "$comma" "$fullname" "$description" "$default"
done
}
function ArgParser::test
{
# Arguments with a default of 'false' do not take paramaters (note: default
# values are not applied in this release)
ArgParser::addArg "[h]elp" false "This list"
ArgParser::addArg "[q]uiet" false "Supress output"
ArgParser::addArg "[s]leep" 1 "Seconds to sleep"
ArgParser::addArg "v" 1 "Verbose mode"
ArgParser::parse "$@"
ArgParser::isset help && ArgParser::showArgs
ArgParser::isset "quiet" \
&& echo "Quiet!" \
|| echo "Noisy!"
local __sleep
ArgParser::tryAndGetArg sleep into __sleep \
&& echo "Sleep for $__sleep seconds" \
|| echo "No value passed for sleep"
# This way is often more convienient, but is a little slower
echo "Sleep set to: $( ArgParser::getArg sleep )"
echo "Remaining command line: ${__argparser__argv[@]}"
}
if [ "$( basename "$0" )" == "argparser.inc.sh" ]
then
ArgParser::test "$@"
fi
对于getopts部分,如果需要较长的命令行选项,使用ksh可能更简单,因为在ksh中更容易完成。
# Working Getopts Long => KSH
#! /bin/ksh
# Getopts Long
USAGE="s(showconfig)"
USAGE+="c:(createdb)"
USAGE+="l:(createlistener)"
USAGE+="g:(generatescripts)"
USAGE+="r:(removedb)"
USAGE+="x:(removelistener)"
USAGE+="t:(createtemplate)"
USAGE+="h(help)"
while getopts "$USAGE" optchar ; do
case $optchar in
s) echo "Displaying Configuration" ;;
c) echo "Creating Database $OPTARG" ;;
l) echo "Creating Listener LISTENER_$OPTARG" ;;
g) echo "Generating Scripts for Database $OPTARG" ;;
r) echo "Removing Database $OPTARG" ;;
x) echo "Removing Listener LISTENER_$OPTARG" ;;
t) echo "Creating Database Template" ;;
h) echo "Help" ;;
esac
done
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 $*
我只是偶尔写一些shell脚本,但没有实践经验,所以任何反馈都很感激。
使用@Arvid Requate提出的策略,我们注意到一些用户错误。忘记包含值的用户会意外地将下一个选项的名称视为值:
./getopts_test.sh --loglevel= --toc=TRUE
将导致"loglevel"的值被视为"——toc=TRUE"。这可以 被避免的。
我从http://mwiki.wooledge.org/BashFAQ/035关于手动解析的讨论中改编了一些关于检查CLI用户错误的想法。我在处理"-"和"——"参数时插入了错误检查。
然后我开始摆弄语法,所以这里的任何错误都是我的错,而不是原始作者的错。
我的方法可以帮助那些喜欢输入带等号或不带等号的长字符的用户。也就是说,它对“——loglevel 9”的响应应该与“——loglevel=9”的响应相同。在——/space方法中,不可能确定用户是否忘记了一个参数,因此需要进行一些猜测。
如果用户使用长/等号格式(——opt=),则=后的空格会触发错误,因为没有提供参数。 如果user有长/空格参数(——opt),如果后面没有参数(命令结束)或参数以破折号开头,该脚本将导致失败。
In case you are starting out on this, there is an interesting difference between "--opt=value" and "--opt value" formats. With the equal sign, the command line argument is seen as "opt=value" and the work to handle that is string parsing, to separate at the "=". In contrast, with "--opt value", the name of the argument is "opt" and we have the challenge of getting the next value supplied in the command line. That's where @Arvid Requate used ${!OPTIND}, the indirect reference. I still don't understand that, well, at all, and comments in BashFAQ seem to warn against that style (http://mywiki.wooledge.org/BashFAQ/006). BTW, I don't think previous poster's comments about importance of OPTIND=$(( $OPTIND + 1 )) are correct. I mean to say, I see no harm from omitting it.
在该脚本的最新版本中,flag -v表示详细打印输出。
将其保存在一个名为“cli-5.sh”的文件中,使其可执行,其中任何一个都将以预期的方式工作或失败
./cli-5.sh -v --loglevel=44 --toc TRUE
./cli-5.sh -v --loglevel=44 --toc=TRUE
./cli-5.sh --loglevel 7
./cli-5.sh --loglevel=8
./cli-5.sh -l9
./cli-5.sh --toc FALSE --loglevel=77
./cli-5.sh --toc=FALSE --loglevel=77
./cli-5.sh -l99 -t yyy
./cli-5.sh -l 99 -t yyy
下面是对用户intpu进行错误检查的示例输出
$ ./cli-5.sh --toc --loglevel=77
ERROR: toc value must not have dash at beginning
$ ./cli-5.sh --toc= --loglevel=77
ERROR: value for toc undefined
您应该考虑打开-v,因为它会打印OPTIND和OPTARG的内部内容
#/usr/bin/env bash
## Paul Johnson
## 20171016
##
## Combines ideas from
## https://stackoverflow.com/questions/402377/using-getopts-in-bash-shell-script-to-get-long-and-short-command-line-options
## by @Arvid Requate, and http://mwiki.wooledge.org/BashFAQ/035
# What I don't understand yet:
# In @Arvid REquate's answer, we have
# val="${!OPTIND}"; OPTIND=$(( $OPTIND + 1 ))
# this works, but I don't understand it!
die() {
printf '%s\n' "$1" >&2
exit 1
}
printparse(){
if [ ${VERBOSE} -gt 0 ]; then
printf 'Parse: %s%s%s\n' "$1" "$2" "$3" >&2;
fi
}
showme(){
if [ ${VERBOSE} -gt 0 ]; then
printf 'VERBOSE: %s\n' "$1" >&2;
fi
}
VERBOSE=0
loglevel=0
toc="TRUE"
optspec=":vhl:t:-:"
while getopts "$optspec" OPTCHAR; do
showme "OPTARG: ${OPTARG[*]}"
showme "OPTIND: ${OPTIND[*]}"
case "${OPTCHAR}" in
-)
case "${OPTARG}" in
loglevel) #argument has no equal sign
opt=${OPTARG}
val="${!OPTIND}"
## check value. If negative, assume user forgot value
showme "OPTIND is {$OPTIND} {!OPTIND} has value \"${!OPTIND}\""
if [[ "$val" == -* ]]; then
die "ERROR: $opt value must not have dash at beginning"
fi
## OPTIND=$(( $OPTIND + 1 )) # CAUTION! no effect?
printparse "--${OPTARG}" " " "${val}"
loglevel="${val}"
shift
;;
loglevel=*) #argument has equal sign
opt=${OPTARG%=*}
val=${OPTARG#*=}
if [ "${OPTARG#*=}" ]; then
printparse "--${opt}" "=" "${val}"
loglevel="${val}"
## shift CAUTION don't shift this, fails othewise
else
die "ERROR: $opt value must be supplied"
fi
;;
toc) #argument has no equal sign
opt=${OPTARG}
val="${!OPTIND}"
## check value. If negative, assume user forgot value
showme "OPTIND is {$OPTIND} {!OPTIND} has value \"${!OPTIND}\""
if [[ "$val" == -* ]]; then
die "ERROR: $opt value must not have dash at beginning"
fi
## OPTIND=$(( $OPTIND + 1 )) #??
printparse "--${opt}" " " "${val}"
toc="${val}"
shift
;;
toc=*) #argument has equal sign
opt=${OPTARG%=*}
val=${OPTARG#*=}
if [ "${OPTARG#*=}" ]; then
toc=${val}
printparse "--$opt" " -> " "$toc"
##shift ## NO! dont shift this
else
die "ERROR: value for $opt undefined"
fi
;;
help)
echo "usage: $0 [-v] [--loglevel[=]<value>] [--toc[=]<TRUE,FALSE>]" >&2
exit 2
;;
*)
if [ "$OPTERR" = 1 ] && [ "${optspec:0:1}" != ":" ]; then
echo "Unknown option --${OPTARG}" >&2
fi
;;
esac;;
h|-\?|--help)
## must rewrite this for all of the arguments
echo "usage: $0 [-v] [--loglevel[=]<value>] [--toc[=]<TRUE,FALSE>]" >&2
exit 2
;;
l)
loglevel=${OPTARG}
printparse "-l" " " "${loglevel}"
;;
t)
toc=${OPTARG}
;;
v)
VERBOSE=1
;;
*)
if [ "$OPTERR" != 1 ] || [ "${optspec:0:1}" = ":" ]; then
echo "Non-option argument: '-${OPTARG}'" >&2
fi
;;
esac
done
echo "
After Parsing values
"
echo "loglevel $loglevel"
echo "toc $toc"