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I'm trying to match only the first block of text between 2 strings: 'menuentry ' and '}' from a file as follows:

Input file:

(some irrelevant text)
menuentry 'My Customized Linux, with Linux 3.10.0-229.14.1.el7.x86_64' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.14.1.el7.x86_64-advanced-/dev/mapper/sysvg-lv_root' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_msdos
        insmod xfs
        set root='hd0,msdos1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  2e420275-8578-449d-9217-ce6d9ae35f70
        else
          search --no-floppy --fs-uuid --set=root 2e420275-8578-449d-9217-ce6d9ae35f70
        fi
        linux16 /vmlinuz-3.10.0-229.14.1.el7.x86_64 root=/dev/mapper/sysvg-lv_root ro  nomodeset rd.lvm.lv=sysvg/lv_swap vconsole.keymap=us rd.lvm.lv=sysvg/lv_root vconsole.font=latarcyrheb-sun16 rootfstype=xfs crashkernel=auto quiet LANG=en_US.UTF-8
        initrd16 /initramfs-3.10.0-229.14.1.el7.x86_64.img
}
menuentry 'My Customized Linux (Rescue)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-2e4c8e37e48347b0b4fa7095fbd707db-advanced-/dev/mapper/sysvg-lv_root' {
        load_video
        insmod gzio
        insmod part_msdos
        insmod xfs
        set root='hd0,msdos1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  2e420275-8578-449d-9217-ce6d9ae35f70
        else
          search --no-floppy --fs-uuid --set=root 2e420275-8578-449d-9217-ce6d9ae35f70
        fi
        linux16 /vmlinuz-0-rescue-2e4c8e37e48347b0b4fa7095fbd707db root=/dev/mapper/sysvg-lv_root ro  nomodeset rd.lvm.lv=sysvg/lv_swap vconsole.keymap=us rd.lvm.lv=sysvg/lv_root vconsole.font=latarcyrheb-sun16 rootfstype=xfs crashkernel=auto quiet
        initrd16 /initramfs-0-rescue-2e4c8e37e48347b0b4fa7095fbd707db.img
}
(some more irrelevant text)

output should be:

menuentry 'My Customized Linux, with Linux 3.10.0-229.14.1.el7.x86_64' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.14.1.el7.x86_64-advanced-/dev/mapper/sysvg-lv_root' {
            load_video
            set gfxpayload=keep
            insmod gzio
            insmod part_msdos
            insmod xfs
            set root='hd0,msdos1'
            if [ x$feature_platform_search_hint = xy ]; then
              search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  2e420275-8578-449d-9217-ce6d9ae35f70
            else
              search --no-floppy --fs-uuid --set=root 2e420275-8578-449d-9217-ce6d9ae35f70
            fi
            linux16 /vmlinuz-3.10.0-229.14.1.el7.x86_64 root=/dev/mapper/sysvg-lv_root ro  nomodeset rd.lvm.lv=sysvg/lv_swap vconsole.keymap=us rd.lvm.lv=sysvg/lv_root vconsole.font=latarcyrheb-sun16 rootfstype=xfs crashkernel=auto quiet LANG=en_US.UTF-8
            initrd16 /initramfs-3.10.0-229.14.1.el7.x86_64.img

}

I'm using sed for this as follows:

sed -n '/^menuentry /,/^}$/p;' /boot/grub2/grub.cfg

But always get the whole text between the first 'menuentry' and last '}'

    [root@ball ~]# sed -n '/^menuentry /,/^}$/p;' /boot/grub2/grub.cfg
menuentry 'My Customized Linux, with Linux 3.10.0-229.14.1.el7.x86_64' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.14.1.el7.x86_64-advanced-/dev/mapper/sysvg-lv_root' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_msdos
        insmod xfs
        set root='hd0,msdos1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  2e420275-8578-449d-9217-ce6d9ae35f70
        else
          search --no-floppy --fs-uuid --set=root 2e420275-8578-449d-9217-ce6d9ae35f70
        fi
        linux16 /vmlinuz-3.10.0-229.14.1.el7.x86_64 root=/dev/mapper/sysvg-lv_root ro  nomodeset rd.lvm.lv=sysvg/lv_swap vconsole.keymap=us rd.lvm.lv=sysvg/lv_root vconsole.font=latarcyrheb-sun16 rootfstype=xfs crashkernel=auto quiet LANG=en_US.UTF-8
        initrd16 /initramfs-3.10.0-229.14.1.el7.x86_64.img
}
menuentry 'My Customized Linux (Rescue)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-2e4c8e37e48347b0b4fa7095fbd707db-advanced-/dev/mapper/sysvg-lv_root' {
        load_video
        insmod gzio
        insmod part_msdos
        insmod xfs
        set root='hd0,msdos1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  2e420275-8578-449d-9217-ce6d9ae35f70
        else
          search --no-floppy --fs-uuid --set=root 2e420275-8578-449d-9217-ce6d9ae35f70
        fi
        linux16 /vmlinuz-0-rescue-2e4c8e37e48347b0b4fa7095fbd707db root=/dev/mapper/sysvg-lv_root ro  nomodeset rd.lvm.lv=sysvg/lv_swap vconsole.keymap=us rd.lvm.lv=sysvg/lv_root vconsole.font=latarcyrheb-sun16 rootfstype=xfs crashkernel=auto quiet
        initrd16 /initramfs-0-rescue-2e4c8e37e48347b0b4fa7095fbd707db.img
}

Any ideas?

adiflinux
  • 33
  • 5

3 Answers3

2

one line sed

sed -n '/^menuentry/,/\}$/{p;/^\}$/q}'

/^\}$/q means that "if the line matches with pattern /^\}$/ then quit"

ymonad
  • 136
  • 1
1

This works for me using multiple passes

sed -n '/^menuentry /,$p' /boot/grub2/grub.cfg | tr '\n' '~' | sed 's/~menuentry.*//' | tr '~' '\n'

Explanation

  • sed -n '/^menuentry /,$p' /boot/grub2/grub.cfg - remove the head of the file up to the first menuentry
  • tr '\n' '~' - convert the output into a single line
  • sed 's/~menuentry.*//' - use sed to remove from \nmenuentry (which is now ~menuentry) to the end of the string
  • tr '~' '\n' - restore the string back to mulitiline output
the_velour_fog
  • 497
  • 2
  • 4
  • 14
1

If Perl will do...

    perl -lne '$p=1 if(/^menuentry/);print if $p;exit if (/^}$/)' /boot/grub2/grub.cfg

gives

menuentry 'My Customized Linux, with Linux 3.10.0-229.14.1.el7.x86_64' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.14.1.el7.x86_64-advanced-/dev/mapper/sysvg-lv_root' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_msdos
        insmod xfs
        set root='hd0,msdos1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  2e420275-8578-449d-9217-ce6d9ae35f70
        else
          search --no-floppy --fs-uuid --set=root 2e420275-8578-449d-9217-ce6d9ae35f70
        fi
        linux16 /vmlinuz-3.10.0-229.14.1.el7.x86_64 root=/dev/mapper/sysvg-lv_root ro  nomodeset rd.lvm.lv=sysvg/lv_swap vconsole.keymap=us rd.lvm.lv=sysvg/lv_root vconsole.font=latarcyrheb-sun16 rootfstype=xfs crashkernel=auto quiet LANG=en_US.UTF-8
        initrd16 /initramfs-3.10.0-229.14.1.el7.x86_64.img
}

or this:

perl -lne 'BEGIN{$/="\nmenuentry "};if($.==2){print $/,$_;last}' /boot/grub2/grub.cfg

(This version sets the perl line splitting to end with the start of the menuentry line, then prints the "second" stanza which is actually the one you want.

Uditha Desilva
  • 141
  • 5