删除/etc/fstab文件中所有以#开头，后面至少跟一个空白字符的行的行首的#和空白字符

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关键命令：sed -ri.bak 's/^#[ :space: ]+(.*$)/\1/g' /etc/fstab

[root@centos7 etc]#cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Wed Dec  8 14:36:50 2021
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=3ba5fbf7-4831-46cc-93f3-5629735cba75 /                       xfs     defaults        0 0
UUID=810998b8-9bb3-4877-9c3c-6e7d808b78b7 /boot                   ext4    defaults        1 2
UUID=a9b62ee2-e201-4043-863f-54f9e3092693 /data                   xfs     defaults        0 0
UUID=04f24731-1b14-4ff2-83ec-59ace629a0ef swap                    swap    defaults        0 0

[root@centos7 etc]#sed -ri.bak 's/^#[ :space: ]+(.*$)/\1/g' /etc/fstab

[root@centos7 etc]#cat /etc/fstab

#
/etc/fstab
Created by anaconda on Wed Dec  8 14:36:50 2021
#
Accessible filesystems, by reference, are maintained under '/dev/disk'
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=3ba5fbf7-4831-46cc-93f3-5629735cba75 /                       xfs     defaults        0 0
UUID=810998b8-9bb3-4877-9c3c-6e7d808b78b7 /boot                   ext4    defaults        1 2
UUID=a9b62ee2-e201-4043-863f-54f9e3092693 /data                   xfs     defaults        0 0
UUID=04f24731-1b14-4ff2-83ec-59ace629a0ef swap                    swap    defaults        0 0

[root@centos7 etc]#