Problems with sed!

[m41d3n]

Can anybody tell does sed command allow user defined variables?

[eakrin]

If you need to cut some substring from string. you can use this way.

TotalMem=`df -h "$1" | grep "$1" | "$BUSYBOX_FILE" awk '{ FS = "[ ]+" } { print $2 }'`

A = `XXX` is mean execute XXX command and return result into A.

I use awk command from busybox.

[Craftbrewer]

If you're asking if you can set and use variables within a sed script, then the answer is no. sed isn't really a script language per se, its more of a macro utility to the ancient unix file 'ed'itor.

sed can use your shell variables as input for text manipulation & pattern matching, but that's about it as far as I know.

And as eakrin pointed out, you can also assign the output of sed (or any command with a return) to a shell var, ie. var=`echo "bigUGLYstring" |sed -e 's/UGLY/ugly/;s/big/BIG/'` Though sed has its place, awk is by far more useful in most circumstances and I'm surprised this wasn't included in the image. (and cut and wc and tr and... LOL)