nixCraft

waltjohn · #1 (**permalink**) 23-05-2009, 11:28 AM

when i type in this command :

Code:

 echo " df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{print $5 " "$1}' "

i get this output:

Code:

 df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{print }

the print variables are missing -

how do i echo this command so the print variable will show?

why are they missing.

nixcraft · #2 (**permalink**) 23-05-2009, 03:54 PM

Try

Code:

echo $(df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{print $5 " "$1}')

To be frank, there is no need to use echo at all:

Code:

df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{print $5 " "$1}'

FYI, this is called "Command Substitution". It allows the output of a command to replace the command name. General syntax:

Code:

var=$(command)
echo "message $(command)"
echo "Today is $(date)"

waltjohn · #3 (**permalink**) 23-05-2009, 10:15 PM

thanks - for security reasons, i dont have interent or email access at work - i echo >> my commands to a text files and transfer them via floppy disk (yes, floppy diskettes, the USB prorts are locked down).

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echo command execute df and pipe output

echo command execute df and pipe output

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