Improving the Output Format of the df Command Using awk in Bash

Introducing how to improve the readability of df using the Bash command awk in the Linux command line language Bash.

awk is interesting.

df
    df: /mnt/_share: Transport endpoint is not connected
    df: /mnt/_share: Transport endpoint is not connected
    df: /mnt/_share: Transport endpoint is not connected
    Filesystem      1K-blocks       Used  Available Use% Mounted on
    rootfs          975731888  913886036   61845852  94% /
    root            975731888  913886036   61845852  94% /root
    home            975731888  913886036   61845852  94% /home
    data            975731888  913886036   61845852  94% /data
    cache           975731888  913886036   61845852  94% /cache
    mnt             975731888  913886036   61845852  94% /mnt
    none            975731888  913886036   61845852  94% /dev
    none            975731888  913886036   61845852  94% /run
    none            975731888  913886036   61845852  94% /run/lock
    none            975731888  913886036   61845852  94% /run/shm
    none            975731888  913886036   61845852  94% /run/user
    C:              975731888  913886036   61845852  94% /mnt/c
    E:             2930133932  381876300 2548257632  14% /mnt/e
    G:             2930133932 1545875952 1384257980  53% /mnt/g
    H:             2930134012 2625853000  304281012  90% /mnt/h

color df 2>/dev/null | awk '{if ($1 ~ /\w{1}:/){print $1,$5,$6}}'
    C: 94% /mnt/c
    E: 14% /mnt/e
    G: 53% /mnt/g
    H: 90% /mnt/h

I wanted to convert the byte count to GB by passing it to Python for division, but I didn’t know how because the command execution was a bit complex.

awk - Assigning system command’s output to variable - Stack Overflow

(Added) I got it working. I posted an article.

Some documentation references for awk.

AWK Cheat Sheet | ShortcutFoo AWK cheatsheet

I improved it.

color df 2>/dev/null | awk '{if ($1 ~ /\w{1}:/){"python -c \"print("$4"/1000/1000)\" | perl -pe 'chomp'" |& getline $11 ; print $1,$11"(GB)",$5,$6}}'
    C: 61(GB) 94% /mnt/c
    E: 2548(GB) 14% /mnt/e
    G: 1384(GB) 53% /mnt/g
    H: 304(GB) 90% /mnt/h

(Added in 2021: Isn’t this just “df -h”? I don’t really understand what I was trying to do back then.