為什麼這些 rsync 過濾器參數在數組中傳遞時會在 bash 中失敗？

為什麼這個 rsync 命令在我按字面意思給出時起作用，但在我從變數創建時不起作用？

這是變數 - 首先是我作為數組傳遞給 rysnc 的選項：

$ echo "${options[@]}"
-av --prune-empty-dirs -f "- *.flac" -f "- *.WMA" -f "- *.wma" -f "- *.ogg" -f "- *.mp4" -f "- *.m4a" -f "- *.webm" -f "- *.wav" -f "- *.ape" -f "- *.zip" -f "- *.rar"

$ echo ${options[6]}
-f

$ echo ${options[7]}
"- *.wma"

然後是源目錄，rsync 是從該目錄複製文件：

$ echo "\"$dir/\""
"/media/test/Ahmad Jamal Trio/Live at the Pershing/"

以及 rsync 要將文件複製到的目標目錄：

$ echo "\"$target_dir\""
"/home/test/mp3/Ahmad Jamal Trio/Live at the Pershing/"

把它們放在一起：

$ echo "${options[@]}" "\"$dir/\"" "\"$target_dir\""
-av --prune-empty-dirs -f "- *.flac" -f "- *.WMA" -f "- *.wma" -f "- *.ogg" -f "- *.mp4" -f "- *.m4a" -f "- *.webm" -f "- *.wav" -f "- *.ape" -f "- *.zip" -f "- *.rar" "/media/test/Ahmad Jamal Trio/Live at the Pershing//" "/home/test/mp3/Ahmad Jamal Trio/Live at the Pershing/"

這一切看起來都應該如此。事實上，如果您按字面意思給出命令，它確實有效，如下所示：

$ rsync -av --prune-empty-dirs -f "- *.flac" -f "- *.WMA" -f "- *.wma" -f "- *.ogg" -f "- *.mp4" -f "- *.m4a" -f "- *.webm" -f "- *.wav" -f "- *.ape" -f "- *.zip" -f "- *.rar" "/media/test/Ahmad Jamal Trio/Live at the Pershing/" "/home/test/mp3/Ahmad Jamal Trio/Live at the Pershing/"
./
Ahmad Jamal Trio - Live at the Pershing - 01 - But Not for Me.mp3
Ahmad Jamal Trio - Live at the Pershing - 02 - Surrey With The Fringe On Top.mp3
Ahmad Jamal Trio - Live at the Pershing - 03 - Moonlight In Vermont.mp3
Ahmad Jamal Trio - Live at the Pershing - 04 - Music, Music, Music.mp3
Ahmad Jamal Trio - Live at the Pershing - 05 - No Greater Love.mp3
Ahmad Jamal Trio - Live at the Pershing - 06 - Poinciana.mp3
Ahmad Jamal Trio - Live at the Pershing - 07 - Wood'yn You.mp3
Ahmad Jamal Trio - Live at the Pershing - 08 - What's New.mp3
AlbumArtSmall.jpg
AlbumArtLarge.jpg
Folder.jpg

sent 43,194,376 bytes  received 285 bytes  28,796,440.67 bytes/sec
total size is 43,182,454  speedup is 1.00

但是當我使用 vars 作為 args 呼叫 rsync 時它失敗了：

$ rsync "${options[@]}" "\"$dir/\"" "\"$target_dir\""
Unknown filter rule: `"- *.flac"'
rsync error: syntax or usage error (code 1) at exclude.c(902) [client=3.1.2]

部分rsync過濾器以及源目錄和目標目錄用額外的轉義引號引用。刪除轉義的引號，它應該可以工作：

options=(
 -av --prune-empty-dirs 
 -f "- *.flac" 
 -f "- *.WMA" 
 -f "- *.wma" 
 -f "- *.ogg" 
 -f "- *.mp4" 
 -f "- *.m4a" 
 -f "- *.webm" 
 -f "- *.wav" 
 -f "- *.ape" 
 -f "- *.zip" 
 -f "- *.rar"
)
dir="/media/test/Ahmad Jamal Trio/Live at the Pershing"
target_dir="/home/test/mp3/Ahmad Jamal Trio/Live at the Pershing"
rsync "${options[@]}" "$dir/" "$target_dir"

我從dirandtarget_dir變數中刪除了尾部斜杠，/已經$dir在rsync呼叫中添加了。

引用自：https://unix.stackexchange.com/questions/550449