LinuxQuestions.org - I would like redirect output to files using shell programming

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ayamkudy

05-21-2011 05:16 AM

I would like redirect output to files using shell programming

I have a huge database of students, I would like extract these data and write to individual file for each students.

I am running a loop in shell program (.sh file), the output of each run in the loop need to redirected to a file with variable name.

I tried the following line, but it did not work, where BodyMsg is the data and Rollno is the students roll number.

echo $BodyMsg > $RolNo".html"

catkin

05-21-2011 05:20 AM

Try echo "$BodyMsg" > "$RolNo.html"

theNbomr

05-21-2011 09:37 AM

If you are executing a loop, you may be writing in multiple steps within the loop. Note that the notation for the first write will probably need to be different from the subsequent writes:

Code:

    echo "$data1" > "$studentFile"

    echo "$data2" >> "$studentFile"

Of course your description of the problem ('doesn't work') adds very little substance. Perhaps you could:

Post a code sample, in [CODE][/CODE] tags, of course
Give a lot more detail about how it didn't work

---- rod.

Nominal Animal

05-21-2011 11:53 AM

Note that you can redirect standard output to a file permanently using

Code:

exec >> file-to-append-to

so you don't need to redirect every individual command.

In your case, you can do e.g.

Code:

#!/bin/sh



# Save original standard output to descriptor 3

exec 3>&1



# Loop over each Name read from standard input:

while read Name ; do



    # Redirect output to append to $Name.html

    exec >> "$Name.html"



    # Do normal output, it will append to $Name.html

    # ...

done



# Restore standard output. This stops further output

# from going into last $Name.html, too.

exec 1>&3

ayamkudy

05-23-2011 08:30 AM

thanks all... it is solved now...

MTK358

05-23-2011 08:51 AM

Mark the thread as solved.

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