摘要：1 #!/bin/sh 2 echo "Is it morning? please answer me" 3 read timeofday 4 5 if [ $timeofday="yes" ]; if与 [] 之间必须有空格 6 then 7 echo "good morning" 8 ... 阅读全文

摘要：ps > test.txt 把进程信息结果写入test.txt 重复调用则会覆盖 ps >>test.txt 重复调用不会覆盖，写入文件末尾 阅读全文