mrco
V2EX  ›  问与答

求教一个 sed 的用法

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  •   mrco · Oct 25, 2016 · 2079 views
    This topic created in 3666 days ago, the information mentioned may be changed or developed.
    GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"
    

    需要在最后的"前面添加一个参数console=ttyS0,该怎么写呢,谢谢!

    9 replies  •  2016-10-25 14:38:18 +08:00
    DiamondbacK
    DiamondbacK
    Oct 25, 2016❤️1
    1
    非 Linux 用户 + sed 菜鸟强势回答:
    sed -r 's#^( *GRUB_CMDLINE_LINUX)="(.*)" *$#\1="\2/console=ttyS0"#'
    mrco
    mrco
    OP
    Oct 25, 2016
    2
    @DiamondbacK
    ```bash
    sed -r 's#^( *GRUB_CMDLINE_LINUX)="(.*)" *$#\1="\2 console=ttyS0"#' /etc/default/grub
    ```

    能解释一下么 ?谢谢!
    DiamondbacK
    DiamondbacK
    Oct 25, 2016
    3
    @mrco
    不会,随便抓了一只猴子在键盘上踩出来的。 XD
    ruin2016
    ruin2016
    Oct 25, 2016
    4
    @mrco
    echo 'GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"'|awk '{gsub(/"$/,"/console=ttyS0\"",$0)}1'
    GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet/console=ttyS0"
    qooweds
    qooweds
    Oct 25, 2016
    5
    $匹配行尾
    sed 's/\"$/ console=ttyS0\"/g'
    不知道是不是楼主的需求
    mrco
    mrco
    OP
    Oct 25, 2016
    6
    @qooweds 可以,但匹配 GRUB_CMDLINE_LINUX 所在的行,然后进行添加.
    DiamondbacK
    DiamondbacK
    Oct 25, 2016
    7
    改进了一下效率
    sed -r ‘/^ *GRUB_CMDLINE_LINUX/s#"(.*)" *$#"\1/console=ttyS0"#’
    DiamondbacK
    DiamondbacK
    Oct 25, 2016
    8
    更正半角单引号
    sed -r '/^ *GRUB_CMDLINE_LINUX/s#"(.*)" *$#"\1/console=ttyS0"#'
    mrco
    mrco
    OP
    Oct 25, 2016
    9
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