How to run any linux command inside AWK command ?
Today we will look at an interesting tip how to run a linux command inside the awk command.
For this trick, we will assign the command to a variable, say cmd and then we will send this command to print which displays its output on shell.
Lets see its syntax.
# awk -v cmd='' '{print | cmd}' OR # awk -v cmd=' ' '{print | cmd}' ### Press return two times to have null filename
Running Linux command inside awk
### Without mentioning file, press return two times
[root@ngelinux ~]# awk -v cmd='df -h' '{print | cmd}'
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 20G 11G 8.2G 56% /
tmpfs 504M 72K 504M 1% /dev/shm
.host:/ 844G 629G 216G 75% /mnt/hgfs
### When mentioning file.
[root@ngelinux ~]# awk -v cmd='df -h' '{print | cmd}' /proc/cpuinfo
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 20G 11G 8.2G 56% /
tmpfs 504M 72K 504M 1% /dev/shm
.host:/ 844G 629G 216G 75% /mnt/hgfs
[root@ngelinux ~]#