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如何在 bash 腳本中使用 fbi 顯示 .jpg 檔案一段時間，然後執行腳本中的下一個命令

tag-icon • tag-icon shell-script images timeout fbi
如何在 bash 腳本中使用 fbi 顯示 .jpg 檔案一段時間，然後執行腳本中的下一個命令

我正在嘗試fbi在 bash 腳本中使用來顯示一系列.jpg圖像。但是一旦fbi開始它的過程，它就會繼續循環瀏覽圖像，我只想在設定的時間段內顯示每個圖像一次。

答案1

免責聲明：我實際上並沒有與聯邦調查局進行測試，我使用了帶有一堆文本文件的手錶（手錶顯示文本，而不是圖像，但它也會運行直到它被殺死，就像聯邦調查局一樣），所以理論上這個（或類似的）技術也應該與聯邦調查局合作。

#!/bin/sh

# Where are the files?
IMG_PATH="/foo/bar/fred/"

cd $IMG_PATH

# File list. Can either be hard-coded, space separated,
# or to use the output of a command, use $(command). The
# safest approach is to use a shell glob as I have done here.
FILE_LIST=*.txt

# How long to run the command in seconds before killing it?
TIMEOUT=1

# For every file on the list...
for FILE in $FILE_LIST
do
  # OK, this is where the magic happens...
  # First invoke a shell and feed the mini script (in double quotes)
  # to that shell. The mini script first executes fbi with whatever
  # filename is now set to $FILE by the loop, meanwhile, whatever is
  # in brackets gets executed simultaneously (sleep for $TIMEOUT seconds
  # then force kill the second shell and all its children, including fbi).
  # What the heck is \$\$? Well, $$ normally refers to the process ID
  # of the script itself. But we don't want to kill the main script with
  # the for loop - we want to loop to go on. So we escape the $$ with
  # backslashes like so \$\$ so that literally "$$" gets passed to the
  # second subshell, so it kills only itself (and fbi as its child).
  #########################
  # You can add parameters to fbi if you need to.
  # Also you may want to try removing the -9 parameter to kill in
  # case it messes up your framebuffer... not sure how well fbi
  # handles a forceful (-9) vs. graceful (no -9) kill.
  sh -c "(sleep $TIMEOUT; kill -9 \$\$) & exec fbi $FILE"
done

我希望這至少能為您指明正確的方向......:)

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