kitsuyui · July 15, 2018 08:00
diff --git a/file1.txt b/file1.txt
 $ run.sh &
 $ vim run.sh
 (30 秒以内に foo を bar に変えて保存する)
 bar
diff --git a/file2.txt b/file2.txt
 $ run.sh &
 $ cp run.sh run.sh.tmp
 $ mv run.sh.tmp run.sh
 $ vim run.sh
 (30 秒以内に foo を bar に変えて保存する)
 foo
diff --git a/file3.txt b/file3.txt
 $ cp run.sh{,.tmp}
 $ mv run.sh{.tmp,}
diff --git a/run.sh b/run.sh
 #!/bin/sh
 sleep 30
 echo foo