customised functions...

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# 1  
Old 03-17-2002
customised functions...

I am going to build some commands/functions for common tasks that I have to perform (things like searching a filesystem for a certain string in a file).

I intend to write these as unix scripts. Then adding the location of these to my path.

How can I ensure that the variables specified when I use the commands are applied to the script.

For example.

I will write a command called grepall - which will search the entire file system from a specified point - returning the filename of files containing the specifed string....

The syntax from the command line would be similar to this....(don't worry if it's not right - just for arguements sake)

find /from/here -type f -print | xargs grep -l "mystring" 2>/dev/null

How do I construct the command to take in the arguements of (starting location) and (mystring) - so that I could just type

grepall /home/dir "hello"

Presumable something like

find $x -type f -print | xargs grep -l $y 2>/dev/null....... but then how do I make the function read in $x and $y from the command line entry?

I am using bash..... on solaris.
# 2  
Old 03-18-2002
Here's one way to go:

#this will make sure only two parameters are being passed from the command line
if [ $# -ne 2 ]
echo "Usage: grepall [dir] [string]"

#this line will use the two arguments from the command line
find $1 -type f -print |xargs grep -l "$2" 2>/dev/null

I can't promise this will work, since I don't have access to a machine running solaris to test, but hopefully this stuff is the same across different unix flavors.
# 3  
Old 03-18-2002
So you basically $1, $2, $3 ....etc will be the variables for every entry on the command line after the command itself..... that simple huh? No assignment requried?
# 4  
Old 03-18-2002
You don't HAVE to assign the arguements that are passed from the comamnd line, but you can.

Did you get a chance to test out the above syntax to see if it worked in your environment?
# 5  
Old 03-18-2002

Yeah - she's all good...thanks for that. Just needed to understand that the arguements can just be 'grabbed' from the command line with $1, $2 ......

The functions work great!

# 6  
Old 03-18-2002
Here's something else to think about for this situation. Take the example usage syntax below:

grepall -d[dir] -s[string]

If you wanted to invoke your script as shown above, it is made possible by a shell command called getopts. I don't use it much, but I have seen it used by co-workers.

Here's a link if you're interested:
Example 11-13.
# 7  
Old 03-19-2002
I would prefer something which "thekid" has suggested, cause that gives the user to give the options any way he needs ... either <expression> <filename> or <filename> <expression>. It would be also a good coding practice to use swtich (-f, is) etc in your program...
Just an advice..

And ys if you intend to use $x and $y... you could do

As you have already figured out, All the arguments are stored in the series $1 $2 $3 ...

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