UNIX for Beginners Questions & Answers

Let's say I have a file written in C programming

Code:

...
int
function A (Param1, Param2)
{
....
}

How to grep this function?

I tried

Code:

grep -ER '^functionA(.*)/n{' filename > result.txt

Not work

Moderator's Comments:

Please use CODE tags on all sample input, output, and code segments; not just on shell code segments.

Code:

awk '
/function/      { print
                i++
                if ( $0 !~ "{") {
                        getline
                        print
                        }
                next
                }
(i)             { print
                if ( $0 ~ "{" )
                        i++
                if ( $0 ~ "}" )
                        i--
}
' file

Thank you for reply

I think the request was "How to grep this function?", i.e. function A. So a small adaption of nezabudka's fine script might be suited for this:

Code:

awk '
/function *A/   {print
                 i++
                 while (! /{/)  {getline           # wait for "{" to occur reading as many lines as it takes
                                 print
                                }
                 next
                }

i               {print
                 if (/{/)       i++
                 if (/}/)       i--
                }
 ' file

Aside, @cmdcmd: "Not work " doesn't really help analyse your code and find possible errors. Post facts: error messages, exit codes, undesired vs. desired output

Hi cmdcmd,
Please be a little more verbose on what you are trying to do.

Are you trying to find the definition of the function named A in you C source file? If so, does it need to include the type of the value returned by the function? Do you want the complete function definition or just the part from function up to and including the first opening brace ({) character?

Are you trying to find all calls to the function named A in your C source file?

The code you provided can't work if you are trying to find the function definition in your C source file because the ERE you're using won't match the <space>s before and after the name of your function.

Assuming that you're using a GNU grep utility (which I don't have available to verify my suggestion) you might come closer to what you were trying to do with:

Code:

grep -EA1 '^function +A *(.*)' filename,c > result.txt

assuming that you're just looking for the text on a line starting with function for the function declaration for the function named A, the function prototype (not including the return code) fits on a single line, that the next line contains the opening brace for the function definition, and that you don't care about the return type of this function.

Just saying that something does not work isn't really helpful. We need to know what doesn't work; what diagnostic were produced, if any; what output it produced; what additional output you wanted; what output it produced that you did not want.