AWK 命令不能正常连接两个输出

Question

I have a simple task to join output from the lsblk command with output from the df command on the field which contains the mount point.

Example output from df :

$ df -P --exclude={tmpfs,devtmpfs,squashfs,overlay} | sed /^Filesystem/d
/dev/mapper/dockerVG-rootLV    51339744   8118908   40583220      17% /
/dev/mapper/ssdVG-ssdLV       515006720 214044372  274731772      44% /dockerssd
/dev/mapper/hddVG-hddLV      1547129060  83285716 1385183760       6% /dockerhdd
/dev/mapper/hddVG-dockerLV    515006720  76061148  412714996      16% /var/lib/docker

Output of lsblk :

$ lsblk -n -b --output KNAME,NAME,SIZE,MOUNTPOINT | egrep -v "fd0|ram|loop|sr0|hdc|cdrom|[SWAP]"


sda   sda                   53687091200
sda1  └─sda1                53684994048
dm-3    └─dockerVG-rootLV   53682896896 /
sdb   sdb                 2147483648000
sdb1  └─sdb1              2147482599424
dm-1    ├─hddVG-dockerLV   536866717696 /var/lib/docker
dm-2    └─hddVG-hddLV     1610612736000 /dockerhdd
sdc   sdc                  536870912000
sdc1  └─sdc1               536869863424
dm-0    └─ssdVG-ssdLV      536866717696 /dockerssd

I am using Awk; here is my current code:

awk '{ print $1 " " $3 " " $4 " " arr[$4] }
/^\// { arr[$6]=$1 " " $2 " " $3 " " $4 " " $5 }' <<< $(
    df -P --exclude={tmpfs,devtmpfs,squashfs,overlay} |
    sed -e /^Filesystem/d
    lsblk -n -b --output KNAME,NAME,SIZE,MOUNTPOINT |
    egrep -v "fd0|ram|loop|sr0|hdc|cdrom|[SWAP]")

Here's the output I currently get:

/dev/mapper/dockerVG-rootLV 8118908 40583220
/dev/mapper/ssdVG-ssdLV 214044380 274731764
/dev/mapper/hddVG-hddLV 83285716 1385183760
/dev/mapper/hddVG-dockerLV 76061152 412714992
sda 53687091200
sda1 53684994048
dm-3 53682896896 / /dev/mapper/dockerVG-rootLV 51339744 8118908 40583220 17%
sdb 2147483648000
sdb1 2147482599424
dm-1 536866717696 /var/lib/docker /dev/mapper/hddVG-dockerLV 515006720 76061152 412714992 16%
dm-2 1610612736000 /dockerhdd /dev/mapper/hddVG-hddLV 1547129060 83285716 1385183760 6%
sdc 536870912000
sdc1 536869863424
dm-0 536866717696 /dockerssd /dev/mapper/ssdVG-ssdLV 515006720 214044380 274731764 44%

I don't need to have this part of the output:

/dev/mapper/dockerVG-rootLV 8118908 40583220
/dev/mapper/ssdVG-ssdLV 214044380 274731764
/dev/mapper/hddVG-hddLV 83285716 1385183760
/dev/mapper/hddVG-dockerLV 76061152 412714992

For me, it is enough to have:

sda 53687091200
sda1 53684994048
dm-3 53682896896 / /dev/mapper/dockerVG-rootLV 51339744 8118908 40583220 17%
sdb 2147483648000
sdb1 2147482599424
dm-1 536866717696 /var/lib/docker /dev/mapper/hddVG-dockerLV 515006720 76061152 412714992 16%
dm-2 1610612736000 /dockerhdd /dev/mapper/hddVG-hddLV 1547129060 83285716 1385183760 6%
sdc 536870912000
sdc1 536869863424
dm-0 536866717696 /dockerssd /dev/mapper/ssdVG-ssdLV 515006720 214044380 274731764 44%

Could You help me please, how to divide this output? Maybe some fix in my Awk command?

Answer 1

Your syntax is rather weird. Probably refactor along the lines of

awk 'NR == FNR {
    if ($1 ~ /^\//) arr[$6]=$1 " " $2 " " $3 " " $4 " " $5 
    next }
/fd0|ram|loop|sr0|hdc|cdrom|\[SWAP\]/ { next }
{ print $1 " " $3 " " $4 " " arr[$4] }' \
    <(df -P --exclude={tmpfs,devtmpfs,squashfs,overlay}) \
    <(lsblk -n -b --output KNAME,NAME,SIZE,MOUNTPOINT)

Filesystem doesn't match ^/ so I took that out. The regex [SWAP] was incorrect; I assume you meant to match that literally. Awk can do everything egrep and sed can do, so I refactored those out.

The beef here is the next inside the first condition, to avoid printing those lines. The refactoring to read two separate file handles also makes the script somewhat more idiomatic and, hopefully, understandable.