随笔分类 -  shell

摘要：#! /usr/bin/perl$ans=max(2,18,3,5);print "Maximum value is $ans\n";sub max{ my $biggest=shift; foreach(@_){ $biggest=$_ if $_>$biggest; }return $biggest;}【说明】$_：当前参数@_：在子程序的调用过程中传值，perl使这些值可以在子程序中可用。 阅读全文

摘要：1 $$：显示PID编号[tandesir@localhost shell]$ echo $80682 $?：退出状态[tandesir@localhost shell]$ echo $?0[tandesir@localhost shell]$ ls test.txtls: 无法访问 test.txt: 没有那个文件或目录[tandesir@localhost shell]$ echo $?2[tandesir@localhost ~]$ true[tandesir@localhost ~]$ echo $?0[tandesir@localhost ~]$ false[tandesir@loc 阅读全文

摘要：运用select和case可以制作简单的交互式菜单。#! /bin/bashselect CHIOCE in show help exitdo case "$CHIOCE" in show) ls ;; help) echo "Help : This is a joke for test!" ;; exit) exit 0 ;; esacdone 阅读全文

摘要：【方法1】运用for in语句(1) bash#! /bin/bash sum=0; for i in {1..100} do ((sum = sum + i)) done echo $sum (2) perl#! /usr/bin/perl $sum=0; for ($i = 0; $i <=100 ; $i+=1) { $sum +=$i; } print "$sum\n"; 【方法2】运用while语句(1) bash#! /bin/bash i=0; sum=0; while [ "$i" -lt 100 ] do ((i = i + .. 阅读全文

摘要：(1) vi bundle.sh#! /bin/bash#bundle :group files into distribution packageecho "# To unbundle, bash this file"for ido echo "echo $i 1>&2" echo "cat >$i <<'End of $i'" cat $i echo "End of $i"done(2) cat h1.txthello1hello2cat h2.txthello3 阅读全文