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    ڵλã > IT؛Y > linux > LinuxA֪RshellַҊ

    LinuxA֪RshellַҊ

    • Դ͘I
    • 2021-09-28 10:42:00
    • x()
    • ֙C

    ַݽȡ

    Ƚ

    ${׃:ʼλ:L}

    lȡַ12345678905λ8λ

    [root@host01 ~]# x="1234567890"

    [root@host01 ~]# echo ${x:4:4}

    5678

    lȡַ12345678903λһλ

    [root@host01 ~]# x="1234567890"

    [root@host01 ~]# echo ${x:2}

    34567890

    [root@host01 ~]# x="1234567890"

    [root@host01 ~]# echo ${#x}

    10

    [root@host01 ~]# echo ${x:2:${#x}}

    34567890

    ȡַ1234567890ǰ5λ

    [root@host01 ~]# x="1234567890"

    [root@host01 ~]# echo ${x:0:5}

    12345

    [root@host01 ~]# echo ${x::5}

    12345

    lȡַ“A񹲺͇”ĵ3λ4λ

    [root@host01 ~]# x="A񹲺͇"

    [root@host01 ~]# echo ${x:2:2}

    ҂Ƚ

    ${׃:0-ʼλ:L}

     ҂Ƚȡַ“A񹲺͇”҂ȵ3λһλ

    [root@host01 ~]# x="A񹲺͇"

    [root@host01 ~]# echo ${x:0-3}

    ͇

    ҂Ƚȡַ“A񹲺͇”҂ȵ3λ_ʼȡ2λ

    [root@host01 ~]# x="A񹲺͇"

    [root@host01 ~]# echo ${x:0-3:2}

    ַ1234567890߅5λ_ʼȡ3λ

    [root@host01 ~]# x="1234567890"

    [root@host01 ~]# echo ${x:5:3}

    678

    ַQ

    1. ֻQһƥY${׃/old/new}

    ַ1234512345Ќһ3Qxxx

    [root@backup ~]# i="1234512345"

    [root@backup ~]# echo ${i/3/xxx}

    12xxx4512345

    2. QȫƥY${׃//old/new}

    ַ1234512345Ќе3Qxxx

    [root@backup ~]# i="1234512345"

    [root@backup ~]# echo ${i//3/xxx}

    12xxx4512xxx45

    ַ1234512345Ќе3Qɿַ

    [root@backup ~]# i="1234512345"

    [root@backup ~]# echo ${i//3/}

    12451245

    ַ݄h

    1. ƥh${׃#*PI~}

    ַhttp://www.sina.com.cnЌð̖“:”߅ַȥ

    [root@backup ~]# i="http://www.sina.com.cn"

    [root@backup ~]# echo ${i#*:}

    //www.sina.com.cn

    ַhttp://www.sina.com.cnЌһ“.”߅ַȥ

    [root@backup ~]# i="http://www.sina.com.cn"

    [root@backup ~]# echo ${i#*.}

    sina.com.cn

    2. Lƥh${׃##*PI~}

    ַhttp://www.sina.com.cnЌ“http://”߅ַȥ

    [root@backup ~]# i="http://www.sina.com.cn"

    [root@backup ~]# echo ${i##*\/}

    www.sina.com.cn

    ַhttp://www.sina.com.cnЌһ“.”߅ַȥ

    [root@backup ~]# i="http://www.sina.com.cn"

    [root@backup ~]# echo ${i##*.}

    cn

    ַhttp://www.sina.com.cnЌһ“w”߅ַȥ

    [root@backup ~]# i="http://www.sina.com.cn"

    [root@backup ~]# echo ${i##*w}

    .sina.com.cn

    3. ƥh${׃%PI~*}

    ַhttp://www.sina.com.cnЌ߅һ“.”߅ַȥ

    [root@backup ~]# i="http://www.sina.com.cn"

    [root@backup ~]# echo ${i%.*}

    http://www.sina.com

    Ӌ㮔ǰűP“/”օ^ĴűPʹ

    [root@backup ~]# df

    Filesystem 1K-blocks Used Available Use% Mounted on

    devtmpfs 487168 0 487168 0% /dev

    tmpfs 497828 0 497828 0% /dev/shm

    tmpfs 497828 7636 490192 2% /run

    tmpfs 497828 0 497828 0% /sys/fs/cgroup

    /dev/sda3 11523072 1674024 9849048 15% /

    /dev/sda1 520868 156640 364228 31% /boot

    tmpfs 99568 0 99568 0% /run/user/0

    t֘R15%ȡxֵo׃i

    [root@backup ~]# df|grep "/$"

    /dev/sda3 11523072 1674100 9848972 15% /

    [root@backup ~]# df|grep "/$"|awk '{print $5}'

    15%

    [root@backup ~]# i=$(df|grep "/$"|awk '{print $5}')

    [root@backup ~]# echo $i

    15%

    ַ“15%”е“%”ȥ

    [root@backup ~]# echo ${i%\%*}

    15

    4. Lƥh${׃%%PI~}

    ַhttp://www.sina.com.cnЌ߅һ“.”߅ַȥ

    [root@backup ~]# i="http://www.sina.com.cn"

    [root@backup ~]# echo ${i%%.*}

    http://www

    ַ׃ʼֵ̎

    ʹecho ${׃:-ֵ}ķʽݔ׃ֵ׃ھݔھݔO“ֵ”

    ׃xӡ׃xֵ;׃xڴӡOֵ

    [root@host01 ~]# x="1234567890"

    [root@host01 ~]# echo ${x:-abc}

    1234567890

    [root@host01 ~]# unset x

    [root@host01 ~]# echo ${x:-abc}

    abc

    ¡LinuxA֪RshellַҊю

    >>ĵַhttp://www.hamptonsurfmovie.com/zhuanye/2021/70185.html

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    ȺW·+ҕl̳+ĿԴa

    漰JavaWebǰUIOӋܛyԇPythonȶITT

    _΢һ߼IȡŶ~

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