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How to extract string between two specified characters and end of line?


 
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# 1  
Old 02-28-2020
How to extract string between two specified characters and end of line?

Hi All,

I am trying to extract a string between two characters in a file and then look up that string in a separate file. E.g. first file is ABC.txt and its contents are
Code:
abc.$$Date
xyz.$$Year.dat
abc.xyz.$$Unit

I want to extract Date in the first line , Year in the second line and Unit in the third line and look it up in a separate file xyz.txt. I tried sed command but missing something. Any help is appreciated.
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!

Last edited by vgersh99; 02-28-2020 at 08:51 PM.. Reason: code tags, please!
# 2  
Old 02-28-2020
Could you show what you've tried and what you think is "missing"?
# 3  
Old 03-02-2020
I used this
Code:
sed 's/.*\$//' test.txt >> aaa.txt

This command works to fetch the data correctly from the $$ till the end of line. But its not sufficing the condition to fetch data from $$ to .

Moderator's Comments:
Mod Comment
Use code tags as required by rules please.
Second time this is mentioned, do not ignore it.

Last edited by Peasant; 03-02-2020 at 01:07 PM..
# 4  
Old 03-03-2020
Simply use two s commands:
Code:
sed 's/.*\$\$//; s/\..*//' test.txt

In the case there is no $$ it will still remove everything after a dot.
The following would avoid that:
Code:
sed '/.*\$\$/ { s///; s/\..*//; }' test.txt

The / / is a selector that works like an if. If true the code in the { } braces is run. The first s command substitutes what matched in the previous / /.
This User Gave Thanks to MadeInGermany For This Post:
# 5  
Old 03-03-2020
Thanks a lot @MadeInGermany. Now if I want to lookup these values in a separate file and substitute the params with actual values what will the code be. Like My other file is having values for all these params like

Code:
$$Date=20200303
$$Year=2020
$$Unit=201

The final file will look like this
Code:
abc.20200303
xyz.2020.dat
abc.xyz.201

--- Post updated at 04:33 PM ---

I am trying with this but getting error.

Code:
#!/bin/bash
BASEDIR=/home/wip4599/
IFILEEXTN=bbb.txt
 key= $(sed 's/\(.*\)\=.*/\1/' bbb.txt)
  value=$(sed 's/.*\=//g' bbb.txt)
  sed 's/$key/$value/g' test.txt
done < $input"

Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!

Last edited by vgersh99; 03-03-2020 at 12:43 PM.. Reason: code tags, please!
# 6  
Old 03-03-2020
when you say I am trying with this but getting error., what does it exactly mean?
What error?
What have you done to investigate the "error"?
Have you considered changing this sed 's/$key/$value/g' to that sed "s/$key/$value/g" ?
# 7  
Old 03-03-2020
The s command in sed takes one $key value and one $value value.
Apparently you need a loop that in each cycle gives one $key/$value pair.

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