bash脚本中的一些特殊字符的用法

最新推荐文章于 2022-01-19 11:15:23 发布

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本文详细介绍了Shell脚本中各种符号和通配符的使用方法，包括单引号、双引号、反引号的作用及区别，以及如何使用通配符进行文件名扩展等。此外还涉及了元字符、花括号展开和圆括号的用法。

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#sigle double inverse quotes
echo "The use of sigle quotes:"
#connect the string, escape the space
echo 'hello world'
#ingore special character such as '\' '$'
echo '$0, will not show the script filename'

echo
echo "The use of double quotes:"
#show the meaning of the special character
echo "$0, will show the script filename"

echo
echo "The use of inverse quotes:"
#"Replace the command with the output"
echo `date`

#the use of wildcard() and metachar
echo "The use of wildcard:"
# *means any,? means one char, [abc]means any one of abc, [!abc] any one but abc, {str1,str2} any one of str1 or str2
ls f*
ls f?le

echo "The use of metachar:"
# the metachar always be used in regex.
#such as ^ means the head of line, $ means the end of line, . means onechar, * meas any chars, x\{m\} meas char x exists in m places
ls grep[^a-z]
ls grep[1-9$]

#the use of brace and parentheses
echo "The use of brace:"
#To split variable and other characters to get true value
name="123"
echo $namehello
echo ${name}hello

echo "The use of parentheses:"
#the same as inverse quotes
echo "Now is:" $(date)
#use as to initial array and command array

echo "The use of semicolon:"
#use to contain two command in one line
echo $PWD;echo $PATH