我有一個腳本可以為多個檔案運行相同的步驟，如下所示：
f_list = 'a b c d'
for f in $f_list
do
echo "start process 1"
code to start process 1
echo "start process 2"
code to start process 2
echo "start process 3" #This step gets the input from step 2
code to start process 3 & #Takes long
echo "process 3 done for ${f} at `date`"
done
我想這樣做：一旦第 3 步開始為串列中的一個元素，迭代串列中的下一個元素而不等待第 3 步結束（無需等待），但是一旦第 3 步完成列印它完成的時間. 我想&在最后添加，但這并不是我想要的，因為它不會列印第 3 步完成的時間。
謝謝
uj5u.com熱心網友回復：
您可以將關聯的行包裹在一對大括號中，并將所述關聯放置在背景中，例如：
for f in $f_list
do
echo "start process 1"
code to start process 1
echo "start process 2"
code to start process 2
echo "start process 3" #This step gets the input from step 2
{ code to start process 3
echo "process 3 done for ${f} at $(date)"
} &
done
如果您需要運行大量步驟作為“流程 3”的一部分，您仍然可以使用{}包裝器，或者您可以使用函式對步驟進行模塊化，例如：
process_3() {
input_file=$1
do some stuff with "${input_file}"
do more stuff with "${input_file}"
do even more stuff with "${input_file}"
echo "process 3 done for ${input_file} at $(date)"
}
for f in $f_list
do
echo "start process 1"
code to start process 1
echo "start process 2"
code to start process 2
echo "start process 3" #This step gets the input from step 2
process_3 "${f}" &
done
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標籤：重击for循环