运行带有嵌入式引号（源参数）的命令时，Bash 脚本失败

Question

我正在使用source 将生成的变量插入文件中的字符串中，以便从 bash 脚本中执行该字符串。

我已经回显了生成的字符串以与从命令行运行的字符串进行比较，我似乎看不出有任何区别，但是 bash 命令失败，因为提供的参数似乎在中间的某个地方混淆了.

我已经在 ice_name 字符串周围转义了双引号，所以它看起来与我回显它时起作用的那个相同

我需要转义其他字符吗？

-ice_name 参数之前似乎混淆了

这是命令

avconv -re -i test.mp3 -c:a libmp3lame -content_type audio/mpeg -b:a 128k -legacy_icecast 1 
-ice_name "Raspi Test Stream of MP3" -f mp3 
icecast://:mypwd@icecast.servername.com/my/mount/point/url

不确定您是否需要该文件，但以防万一

#!/bin/bash
#
# stream.cfg
#
# WiFi Settings
#
wifi_name=mywifi
wifi_password=mywifipwd
#
# Icecast Server Settings
#
icecast_server=icecast.server.com
icecast_port=443
icecast_mount_url=/user/mountpt/url
icecast_show="RPi Demo Show - autostart"
icecast_description="Test of Stream from RPi USB Audio to Spreaker"
icecast_user=""
# Source password
icecast_password=sourcepwd
#
# avconv setting for Raspbian Jessie Lite
# may not need if you're using a self compiled ffmpeg version
#
icecast_legacy=1
#
# Stream Settings - probably not safer to go higher unless great internet connection
#
stream_bitrate=128k

处理配置文件并生成流命令的脚本

#!/bin/bash
#
# autostart-settings.sh
#
# Load in config file settings

CONFIG_FILE=~/autostart/autostart-settings.cfg

# Check if file exists
echo "does file exist"
if [ ! -f "$CONFIG_FILE" ]; then
    echo "Config File: $(CONFIG_FILE) does not exist"
    exit 1
else
    # process settings
    echo "running source on $CONFIG_FILE"
    source "$CONFIG_FILE"
fi

start_cmd="avconv -re -i /home/pi/test.mp3 -c:a libmp3lame -content_type audio/mpeg -b:a $stream_bitrate -legacy_icecast $icecast_legacy"

stream_parameters="-ice_name \"$icecast_show\" -f mp3"

icecast_setup="icecast://$icecast_user:$icecast_password@$icecast_server:$icecast_port$icecast_mount_url"

test_cmd="$start_cmd $stream_parameters $icecast_setup"
echo "Testing command: $test_cmd"

# Run command
$test_cmd

Answer 1

在字符串中嵌入引号不会转义被换行的字符；它们只是值中的文字字符。您需要为此使用数组：

cmd=avconv
args=(-re -i /home/pi/test.mp3 -c:a libmp3lame -content_type audio/mpeg -b:a "$stream_bitrate" -legacy_icecast "$icecast_legacy")

stream_parameters=(-ice_name "$icecast_show" -f mp3)

icecast_setup="icecast://$icecast_user:$icecast_password@$icecast_server:$icecast_port$icecast_mount_url"

test_cmd="$start_cmd $stream_parameters $icecast_setup"
echo "Testing command: $cmd ${args} ${stream_parameters[@]} $icecast_setup"

# Run command
"$cmd" "${args[@]}" "${stream_parameters[@]}" "$icecast_setup"