复制代码 代码如下:
#!/bin/bash
my_name="jxq"
echo $my_name
echo ${my_name}
# ------------------------------------
# 字符串操作
# ------------------------------------
# 单引号字符串的限制,双引号没有这些限制:
# 单引号里的任何字符都会原样输出,单引号字符串中的变量是无效的
# 单引号字串中不能出现单引号(对单引号使用转义符后也不行)
name="will"
age=24
my_full_name='${name}${age}'
echo ${my_full_name}
my_full_name="${name}${age}"
echo ${my_full_name}
# 字符串拼接
echo ${name}${age}
# 字符串长度
echo ${#name} # 4
# substring
message="I want to be healthy"
echo ${message:2} # want to be health, 2是position
echo ${message:2:4} # want,2是position,4是len
# delete shortest match from front: ${string#substring}
echo ${message#*want}
# delete shortest match from back: ${string%substring}
echo ${message%healthy}
# delete longest match from front: ${string##substring}
echo ${message##*h}
# delete longest match from back: ${string%%substring}
echo ${message%%t*}
# find and replace: ${string/pattern/replacement}
book_name="Catch Eye Eye"
echo ${book_name/Eye/Cat}
# find and replace all match: ${string//pattern/replacement}
echo ${book_name//Eye/Cat}
file_path="/usr/local/bin"
# only replace when pattern match the beginning: ${string/#pattern/replacement}
echo ${file_path/#\/usr/tmp}
# only replace when pattern match the end: ${string/%pattern/replacement}
echo ${file_path/%bin/tmp}
# string index
stringZ=abcABC123ABCabc
echo `expr index "$stringZ" C12` # Mac OSX不支持expr
# ------------------------------------
# 语句
# ------------------------------------
# if
if true
then
echo "ok, true"
fi
# 写成一行
if true; then echo "ok"; fi
var='12'
if [ $var -eq 12 ]; then
echo "This is a numeric comparison if example"
fi
if [ "$var" = "12" ]; then
echo "This is a string if comparison example"
fi
if [[ "$var" = *12* ]]; then
echo "This is a string regular expression if comparison example"
fi
name="jxq"
if [ "$name" = "jxq" ]; then
echo "hello" $name
fi
# 循环语句
for item in `ls *.sh`
do
echo $item
echo "completed"
done
# 写成一行
for item in `ls *.sh`; do echo $item; echo "completed"; done;
counter=1
while :
do
echo "bee"
let "counter=$counter+1"
if [ $counter -eq 3 ]; then
break # break/continue与Java类似
fi
done
# Case语句
opt="install"
case "${opt}" in
"install" )
echo "install..."
exit
"update" )
echo "update..."
exit
*) echo "bad opt"
esac
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P70系列延期,华为新旗舰将在下月发布
3月20日消息,近期博主@数码闲聊站 透露,原定三月份发布的华为新旗舰P70系列延期发布,预计4月份上市。
而博主@定焦数码 爆料,华为的P70系列在定位上已经超过了Mate60,成为了重要的旗舰系列之一。它肩负着重返影像领域顶尖的使命。那么这次P70会带来哪些令人惊艳的创新呢?
根据目前爆料的消息来看,华为P70系列将推出三个版本,其中P70和P70 Pro采用了三角形的摄像头模组设计,而P70 Art则采用了与上一代P60 Art相似的不规则形状设计。这样的外观是否好看见仁见智,但辨识度绝对拉满。
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