Shell Programming and Scripting

I want to create a shell script which should be doing following things .. i have the commands but do not know how to tie them up together.

1. . Go to a pre-defined directory and look for a specific pattern txt files like abc12* and select the latest file with abc12*

Code:

ls |awk '{if($NF ~ "fin") {print $NF}}' | sort -r | sed -ne '1p

2. If file exist then put it for further processing in another command

Code:

k="$( cat $i | cut -d"|" -f49 )"

3. Then save the different files with name of o/p you get in the above command

Code:

"${i}" >> "/tmp/outputs/${k}"

4. Then move the file to some different folder and clean up the current directory.

Code:

rm -rf $i

5. Script should exit after processing and removing the file. And if it runs again and didn't find the file then also it should exit.


Any help is appreciated.

What do you understand by "latest"


What is the output of ls ? Do you have space in filename? Maybe a ls -r *fin* | head -1 can solve your problem.

You don't need the cat k="$( cut -d"|" -f49 $i )"

Where you declare ${i} ? Try to post your script.


Do you need a temporary file?

1. yep u were right

Code:

 ls -r *fin* | head -1

can help me as its giving me the same output as the other command.

Code:

 ls |awk '{if($NF ~ "fin") {print $NF}}' | sort -r | sed -ne '1p

2. and i used cat when i was running the individual command from the user prompt and wanted to see the o/p


3. i want following code in such a way that " i " should be used used from
the result of above command.

Code:

while read i; do
    k="$( echo $i | cut -d"|" -f29 )"
    echo "${i}" >> "/tmp/outputs/${k}"
done < fin.txt

4. Nope i do not need temporary file. Its just that these txt (flat) files are created by a program and then one file has to be selected out of other files which is most recent. And then that file has to be removed once processing is done on that file.

What about:

Code:

while read i; do
    echo "${i}" >> "/tmp/outputs/$(cut -d"|" -f29 $i)"
done < fin.txt

nope that didn;t work i do not want to change

Code:

while read i; do
    k="$( echo $i | cut -d"|" -f29 )"
    echo "${i}" >> "/tmp/outputs/${k}"
done < fin.txt

I just want to tie it up with other things ..

1. lookout for most recent file out of bunch of files and then use the output (file name ) for $i

2. run the code sort the files according to it and then move the file to some other location.