command Bash shell offers debugging options which can be turn on or off using set command. => set -x : Display commands and their arguments as they are executed. => set -v : Display shell input lines as they are read.
You can use above two command in shell script itself:
#!/bin/bash clear # turn on debug mode set -x for f in * do file $f done # turn OFF debug mode set +x ls # more commands
You can replace standard #!/bin/bash with (for debugging) #!/bin/bash -xv
Method # 3: Use of intelligent DEBUG function Add special variable _DEBUG. Set to `on’ when you need to debug a script: _DEBUG="on"
Put the following function at the beginning of the script:
function DEBUG() { [ "$_DEBUG" == "on" ] && $@ || : } Now wherever you need debugging simply use DEBUG function DEBUG echo "File is $filename" OR DEBUG set -x Cmd1 Cmd2 DEBUG set +x
When debugging done and before moving a script to production set _DEBUG to off No need to delete debug lines. _DEBUG="off" # set to anything but not to 'on'
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如何在Unix/Linux系统下调试脚本程序
