>3) How do i write to a new file everytime the script is executed. The name is not very important.
for this purpose, you can also use mktemp ... man mktemp
any feedback ?
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Reading, writing and substring operations in Shell Script
I am new to shell scripts so please excuse my newbie questions or mistakes
1) How do i read a file into a shell script variable.? While reading i should preserve all special characters, tabs, carriage returns etc, ineffect everything that is there in that file should be kept as is. A text file needs to be created by this script which will further be processed by a Java program.
2) Once i read the file, i need to check if the first 2 characters are **.
3) How do i write to a new file everytime the script is executed. The name is not very important.
Thank you all for your help
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Answers
There are two powerful utilties that you can use.
Sed and Awk. I advise you to go to google and do a search on shell scripting tutorial and simply walk through the step by step guides that you find.
Second, go to google and do a search on Sed and Awk tutorial and work through those.
What you are trying to achieve is relatively simple, and could probably get what you need within a few hours of going through the tutorials.
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by: sunnycoderPosted on 2003-10-22 at 02:54:05ID: 9597572
>How do i read a file into a shell script variable.?
for i in `cat filename`
or you can use
cat filename | while read line
>While reading i should preserve all special characters, tabs, carriage returns etc, ineffect everything that is there
>in that file should be kept as is.
first method I listed will not preserve newlines and other formatting while second one will
whether you should preserve them or not depends on your application needs
>A text file needs to be created by this script which will further be processed by a Java program.
why not use cp if you are simply copying it !!
>2) Once i read the file, i need to check if the first 2 characters are **.
use grep ^** or sed if you wish to replace them ... more details will be helpful
>3) How do i write to a new file everytime the script is executed. The name is not very important.
a simple way could be to keep a count in a file ... increment this count everytime you write to a newfile
generate name as
newfile.<count from file>