shell脚本动画小工具

看gif图:

shell脚本版

脚本内容如下:

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#!/usr/bin/env bash

## ------------------------------------------------------------
## Author:博客园——骏马金龙
## shell scripts:https://www.junmajinlong.com/others/shell_perl_gif
## ------------------------------------------------------------

## Usage:$0 "COMMAND"
## you must enclosing the COMMAND by double-quotes
## example1: $0 "sleep 3;echo haha"
## example2: $0 "service mysql start"

killmyself="pkill -13 -f `basename $0`"

trap "$killmyself" sigint

while true;do
for i in '-' "\\" '|' '/';do
printf "\r%s" $i
sleep 0.2
done
done &

bgpid=$!

tmp="`bash -c \"$@\"`"
kill $bgpid
printf "\r%s\n" "$tmp"
$killmyself

必须将待运行的命令放进引号中包围,并作为脚本的参数。

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## example1: $0 "sleep 3;echo haha"
## example2: $0 "service mysql start"
## example3: $0 "service mysql stop"

perl版

下面是用perl写的,作用完全一样。将内容保存到一个文件中,赋予可执行权限即可。同样,待执行的命令需要使用双引号包围。

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#!/usr/bin/env perl
use strict;
use warnings;
#use Time::HiRes qw(sleep);

defined(my $pid = fork) or die "can't fork child: $!";

unless($pid){
# 子进程
select STDOUT; $| = 1;
while(1){
foreach my $i ('-','\\','|','/'){
printf("\r%s",$i);
#sleep(0.1);
# 有些低版本的perl没有Time::HiRes标准模块,所以使用select
select(undef,undef,undef,0.1)
}
}
}

# 捕获信号SIGINT,放在unless()后面,可以保证不会监控到子进程
$SIG{'INT'}='trap';
sub trap {
kill INT => $pid or die "Cannot signal to $pid with SIGINT: $!";
die "";
}

my $var = `/bin/sh -c "@ARGV"`;
kill INT => $pid or die "Cannot signal to $pid with SIGINT: $!";
printf "\r%s",$var;

假如该perl文件名为mygif.pl,用法:

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./mygif "sleep 3;echo haha"
./mygif "service mysql start"
./mygif "service mysql stop"