shell脚本中-n是判断一个变量是否是否有值

#其他参数还有-n,-n是判断一个变量是否是否有值


if [ ! -n "$myVar" ]; then

echo "$myVar is empty"

exit 0

fi 

沃建设#each_day_file_processed_number /home/unicomlabs/*_bak5/log/log_*

        for j55 in `ls /home/unicomlabs/|grep bak5`

        do

        for j5 in `ls  /home/unicomlabs/$j55/log/log_* |grep _${pre_date1}`

        do

        cat $j5|wc -l >> /home/unicomlabs/ip5.txt;

        done

        if [ ! -n "$j5" ]

        then

        echo "0" >> /home/unicomlabs/ip5.txt

        fi

        done