script to search character

ust · 06-27-2012, 05:34 AM

I have a master file (master.txt), the content is as below

#vi master.txt
aaa
bbb
ccc
ddd
eee
fff
ggg

I also have some file (eg. file1.txt , file2.txt , file3.txt ... ) , these files may be have the characters as above , for example
#vi file1.txt
123456 aaa 54

#vi file2.txt
1456456 bbb 452

#vi file3.txt
667766 ccc 123

like above , file1.txt have aaa , file2.txt have bbb , file3.txt have ccc , I would like to sort it out , to output a file (matching.txt) that match the file name with the character as below .

#vi matching.txt
aaa file1.txt
bbb file2.txt
ccc file3.txt
ddd "
eee "
fff "
ggg "

can advise what can i write the script ?

Thanks in advance.

pan64 · 06-27-2012, 05:40 AM

look at the man page of grep, and take care about the flags, especially -f and -l

ust · 06-27-2012, 05:58 AM

thx reply ,

I know grep is help to do it , but I am not familiar with script writing , can advise the script ?

Thanks.

grail · 06-27-2012, 07:18 AM

I think the point was you could just use grep, ie no extra scripting required. Generally a script is devised to alleviate a repetitive task. As this would be a single line entry
you probably wouldn't waste time to then place it in a script (your choice of course).

If you are not sure where to start, have a look at the link below to help kick you off:

http://tldp.org/LDP/abs/html/

pixellany · 06-27-2012, 08:05 AM

ust;

Writing a script does not have to be complex and difficult. It starts with finding the commands that will do the task---and then simply combining them in one file. Suppose you want to search in a file for the word "fred":

Code:

grep "fred" filename

Now you want to search in all the files in a directory:

Code:

grep "fred" *

This will try to search directory names also, so you can provide for more control using:

Code:

for filename in *; do grep fred $filename; done

This does the same thing, but now you can add more logic---eg. a test for a directory

When you have a set of commands that does what you want, then add "#!/bin/bash" at the beginning, make the file executable, and now you have a script....

Code:

#!/bin/bash
for file in *; do
        if [ -f $file ]; then
                grep abc $file
        fi
done

ust · 06-27-2012, 06:04 PM

thx reply ,

may be I simpifiy my requirement , if I just would like to list out the line ( in the master file ) that do not appear in any files , eg. if aaa is not exist in any files , then output aaa to the output file ; if bbb is exist in file1.txt (any files would be ok , assume exist in file1.txt now ) , then do not output bbb to the output file ; if ccc is not exist in any files , then output ccc to the output file ..

I just would like to output a file to show all lines that do NOT appear in any file .

the output file as below
#vi output.txt
aaa
ccc

can advise what can i do ?

I just would like to output a file to show all lines that do NOT appear in any file .

chrism01 · 06-27-2012, 09:02 PM

At least have a try and then show us where you got stuck; you've been here a long time.
http://rute.2038bug.com/index.html.gz
http://tldp.org/LDP/Bash-Beginners-G...tml/index.html
http://www.tldp.org/LDP/abs/html/