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shell iterates over folders and outputs

2022-08-10 08:59:00 【RemoteDev】 

dir=/usr #default directoryif [ -n "$1" ]; then //if parameter 1 is not emptydir=$1 #Modify the default directory to the parameter valueecho "Directory: ${dir}" #Display directoryelseecho "first argument is empty"ficd ${dir} #Enter the directory#Loop through the directory `ls -d */` command to get the directory setfor item in `ls -d */`; doecho ${item} #output directorydone

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