bash - Parse/proc/mounts 和 substitude 只有一个字段

Question

我正在寻找一种从/proc/mounts 打印信息的方法:

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

我尝试:

awk '{ print $2 " " $1; gsub("/","",$2); print "/dev/mapper/"$2" "$2 }' /proc/mounts

但结果是两行:

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

有没有人有解决办法？

Answer 1

修复

• use printf ( to avoid the implicit linefeed )
• add whitespace to separate the printf from the gsub output

调整命令

awk '{ printf $2 " " $1 " "; gsub("/","",$2); print "/dev/mapper/"$2" "$2 }' /proc/mounts

输入.txt

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

输出

$ awk '{ printf $2 " " $1 " "; gsub("/","",$2); print "/dev/mapper/"$2" "$2 }' input.txt 
/home /dev/mapper/home /dev/mapper/home home