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loop to replace txt and add command inside of colon (:)

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# 1  
Old 04-20-2010
loop to replace txt and add command inside of colon (:)
in one of my script..I have some thing like
Code:
john:christina : one::
and i want to make it like 
john:chritina:two:(date command):jackey:

basically change 'one' to 'two' and run date :command and add other name:
Last edited by Learnerabc; 04-20-2010 at 01:24 AM.. Reason: to put code tag
# 2  
Old 04-20-2010
Not sure what you are looking for:

Code:
echo "john:christina : one::" | awk '{sub(/ one:/,"two");print $0,time,":something"}' time=`date '+%Y%m%d'`


cheers,
Devaraj Takhellambam
# 3  
Old 04-20-2010
Quote:
Originally Posted by devtakh
Not sure what you are looking for:

Code:
echo "john:christina : one::" | awk '{sub(/ one:/,"two");print $0,time,":something"}' time=`date '+%Y%m%d'`

cheers,
Devaraj Takhellambam

thanks for reply sir
can you please explain what 'sub' is? and is print legal in unix?
# 4  
Old 04-20-2010
Try this:
Code:
echo "john:christina : one::" | sed "s/one::/two:$(date '+%Y%m%d'):/"

# 5  
Old 04-20-2010
First thing, I am not very sure if the above code serves your purpose.

sub means substitute. You should read man pages of awk. In the above code, awk tries to substitue the string "one" with "two" and then print the substituted text as well as the date o/p and some other text.

Print is very legal in unix. It basically prints what is instructed to print, it can either print on the console or a file.
# 6  
Old 04-20-2010
Quote:
Originally Posted by devtakh
First thing, I am not very sure if the above code serves your purpose.

sub means substitute. You should read man pages of awk. In the above code, awk tries to substitue the string "one" with "two" and then print the substituted text as well as the date o/p and some other text.

Print is very legal in unix. It basically prints what is instructed to print, it can either print on the console or a file.
Code:
#!/bin/bash
read -p "one name:" nme
read -p "second name" sn
file1="${nme}:${sn}:one::"
if grep -q "$file1" listfile
then
echo "$file1"| sed "s/one::/two:$(date '+%Y%m%d'):/"
else
echo "The book is checked out"
fi

I have something like this..it is not working it does not change the original format of listfile..what this is doing is just executing else statement.

same with your code...any suggestion?
# 7  
Old 04-20-2010
Does your file "listfile" has the string contents you entered from the keyborad?
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