Unix/Linux 脚本中 "set -e" 的作用example:----------------------------------------------------------- #！/bin/bashset -ecommand 1 command 2 ... ----------------------------------------------------------Use set -e Every script you write should include set -e at the top. This tells bash that it should exit the script if any statement returns a non-true return value. The benefit of using -e is that it prevents errors snowballing into serious issues when they could have been caught earlier. Again, for readability you may want to use set -o errexit. Using -e gives you error checking for free. If you forget to check something, bash will do it or you. Unfortunately it means you can"t check $？ as bash will never get to the checking code if it isn"t zero. There are other constructs you could use: commandif [ "$？"-ne 0]; then echo "command failed"; exit 1; fi could be replaced with command || { echo "command failed"; exit 1; } or if ！ command; then echo "command failed"; exit 1; fi What if you have a command that returns non-zero or you are not interested in its return value？ You can use command || true, or if you have a longer section of code, you can turn off the error checking, but I recommend you use this sparingly.
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