The Korn and Bourne Again shells (ksh and bash) have builtin mechanisms for filtering your data from a variable.
The following is taken directly from the book "Learning the Korn Shell" (ISBN 1-56592-054-6):
Keep in mind that this doesn't match regular expressions; the ".*" really matches a "." and then more, not just any character.
It's good for speed, instead of calling basename $path, or saying something like echo $path | sed 's/.*\///g'.
Try using time to figure out how much faster it is to do it that way...
HI
what does the $(NF) means.
here i want to understand the working.
what i know is that in awk NF argument will tell number of column in a file
i have below file
alpha
a
beta
b
if i use command cat kv | paste - - | awk '{print $1," "$2 "------>"$(NF)}'
i get the o/p as
alpha ... (3 Replies)
Hi,
I have seen in some ksh script, that we are executing shell scripts inside other shell script as
. variable.sh
What is . here? Their is space between . and variabloe. And why we are not executing it like ./variable.sh? I know that . signifies current directory , but what its... (2 Replies)
Can you please tell me what this means?
use grep to find from the file myfile.txt all lines containing the sequence tt but not more 2 ts?
I have no idea. (2 Replies)
I found a file in my base folder width the name replace.sh and width the text string.
sed -i "s/$1/$2/g" `grep -ir $1 ./*|grep -v '.svn'|cut -d: -f1`
Wat does it mean and what does it do? (1 Reply)
I have a command called
cd $HDRROOT/release/tools/cfg
My query is what it means?
tHat is.... $HDRROOT part is not clear.
If I put this command it says path not found....
I doubt that $HDRROOT is trying to mean smething I am not clear of.
PL help......... (4 Replies)