bash - 如果文件存在，如何在脚本中继续？

Question

如果文件存在，如何在脚本中继续？

#!/bin/bash
echo "Start"
# waiting to be exist file
echo "file already exists, continuing"

Answer 1

如果 sleep X 则执行 while，这样它将每 X 秒检查一次文件是否存在。

当文件存在时，while 将结束，您将继续 echo "file already exists, continuiing"。

#!/bin/bash
echo "Start"
### waiting to be exist file
while [ ! -f "/your/file" ]; # true if /your/file does not exist
do
  sleep 1
done
echo "file already exists, continuing"

---

And goes instead of checking the file existence check if the script has already completed the background?

根据您发布的代码，我做了一些更改以使其完全正常工作:

#!/bin/bash
(
sleep 5
) &

PID=$!
echo "the pid is $PID"

while [ ! -z "$(ps -ef | awk -v p=$PID '$2==p')" ]
do
  echo "still running"
  sleep 1
done

echo "done"