解析 /proc/mounts 并仅替换一个字段

Question

我正在寻找一种方法来打印来自 /proc/mounts 的信息，就像这样：

/home     /dev/md9    /dev/mapper/home    home
/var/tmp  /dev/md7    /dev/mapper/vartmp  vartmp

我试试：

awk '{ print  " " ; gsub("/","",); print "/dev/mapper/"" " }' /proc/mounts

但结果是两行:

/home /dev/mapper/home
/dev/mapper/home home
/var/tmp /dev/md7
/dev/mapper/vartmp vartmp

有人有解决办法吗？

Answer 1

修正

use printf ( to avoid the implicit linefeed )

add whitespace to separate the printf from the gsub output

调整命令

awk '{ printf  " "  " "; gsub("/","",); print "/dev/mapper/"" " }' /proc/mounts

input.txt

/dev/mapper/home /home blah blah blah blah

输出

$ awk '{ printf  " "  " "; gsub("/","",); print "/dev/mapper/"" " }' input.txt 
/home /dev/mapper/home /dev/mapper/home home

Parse /proc/mounts and substitude only one field