shell脚本elseif

A. 闂涓涓狲hell鑴氭湰闂棰桡纴鍏充簬𨱒′欢娴嬭瘯

If hao
....
Elif buhao
...
Else
...
Fi
镓嬫満镰侊纴澶ф傛剰镐濅綘镍傦纴鍙浠ョ敤elif 濡傛灉娌℃湁灏辨槸elseif

B. shell的awk中用if..else，怎么多条件嵌套

else和if之间要有个空格

C. shell脚本if then else的问题

问题出在echo("true")或者echo("false")这一句，ftp里面不支持，你手动执行一下就知道了。

ftp>echo("true")
?Invalidcommand
ftp>help
Commandsmaybeabbreviated.Commandsare:

!	debug	mdir	sendport	site
$	dir	mget	put	size
account	disconnect	mkdir	pwd	status
append	exit	mls	quit	struct
ascii	form	mode	quote	system
bell	get	modtime	recv	sunique
binary	glob	mput	reget	tenex
bye	hash	newer	rstatus	tick
case	help	nmap	rhelp	trace
cd	idle	nlist	rename	type
cp	image	ntrans	reset	user
chmod	lcd	open	restart	umask
close	ls	prompt	rmdir	verbose
cr	macdef	passive	runique	?
delete	mdelete	proxy	send

D. shell 脚本中后台调用函数结束

比面shell脚本文件：#===========test.sh! /bin/shecho_line(){ echo date echo "Wellcome to shell func!"}echo_hello(){ echo "Hello World!"}#======================shell调用两函数啊我用【./test.sh echo_hello】却没输我已经给test.sh加执行权限
请问envsetup.sh边
function gettop()
{
local TOPFILE=build/core/envsetup.mk
if [ -n "$TOP" -a -f "$TOP/$TOPFILE" ] ; then
echo $TOP
else
if [ -f $TOPFILE ] ; then
# The following circumlocution (repeated below as well) ensures
# that we record the true directory name and not one that is
# faked up with symlink names.
PWD= /bin/pwd
fi
}并没返值
调用何获取参数 T=$(gettop)
实际参数谢谢

E. shell脚本， if语句必须要有else吗

不必须，可以直接
if 【条件】
【要做的内容】
fi;
这样就可以了。也可以用else
if 【条件1】
【要做的内容1】
else if 【条件2】
【要做的内容2】
fi;

F. 鍦↙inux绯荤粺涓嬶纴缂栧啓涓涓猄hell鑴氭湰锛屼粠阌鐩樿诲叆5涓鏁存暟锛岀劧钖庢樉绀烘渶澶ф暟銆佹渶灏忔暟銆佸拰骞冲潎鏁般

#!/bin/bash

#浠绘剰杈揿叆5涓鏁帮纴鍒ゆ柇链澶у硷纴链灏忓硷纴镐诲拰

s=0

read -p "please input:" num

s=$(($s+$num))

max=$num

min=$num

avg=$(($s/5))

for i in `seq 4`

do

read -p "please input:" num
s=$(($s+$num))

if [ $num -le $min ];then
min=$num
fi

if [ $num -ge $max ];then
max=$num
fi

done

echo max:$max min:$min avg:$avg

镓╁𪾢璧勬枡锛

for寰鐜锛

涓鑸镙煎纺涓猴细

for var in item1 item2 ... itemN

do

command1

command2

...

commandN

done

鍐欐垚涓琛岋细

for var in item1 item2 ... itemN; do command1; command2钬 done;