Reading and Writing Files ? - UNIX for Dummies Questions & Answers

tracydp · #1 (**permalink**) 08-29-2006

Hello,
Our group is just starting to get into UNIX here. We are former REXX users on a VM Mainframe. Can someone point me to the documentation to read a file and write a file in a Unix Shell Script or does this have to be done in another language?
Thank you in advance...
Dave

reborg · #2 (**permalink**) 08-29-2006

The answer depends (to some extent) on what you want to do.

Do you need sequential or random access to the file?

tracydp · #3 (**permalink**) 08-30-2006

Hello,
Yes it would be sequential. Read a record from a file and write to another file.
Thank you...
...Dave

blowtorch · #4 (**permalink**) 08-30-2006

A simple way to read lines from one file, do some processing and write to another is this:

Code:

while read line; do
   # do some processing on variable $line, maybe hold the result in another variable
   echo $variable_holding_result >> output_file # the variable may be $line
done < input_file

If you need help with the scripting, go here.

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