how to execute new command with awk - if/then/else?

martin · *nix forums beginner Joined: 22 Feb 2005 Posts: 44

thank you! you were right - those little changes got my code a'working
Smile

sorry the statements were tough to read, but i wanted to write it on a
single line just to make sure i was doing it correctly (new to this, ya
know ;^)
thanks again
martin

Ed Morton · *nix forums Guru Joined: 20 Feb 2005 Posts: 1073

martin wrote:

martin · *nix forums beginner Joined: 22 Feb 2005 Posts: 44

ok, i tried to format code from your example into a single line string
of command statements...
the first time, i included the "> /dev/null/" portion, which i have no
idea what it means or causes to happen... here's the cut/paste of the
command exactly as i entered it... and, following that, the error
output from terminal.

../alan 3build6.alan >newtestoutput.txt ; if grep "No warnings"
newtestoutput.txt > /dev/null/ ; then ; ./arun 3build6 ; else ; printf
"bad compile, check file\n" ; end if ;

/dev/null/: Not a directory.

so i removed the dev/null/ portion and tried again, this time with a
different error.

../alan 3build6.alan >newtestoutput.txt; if grep "No warnings or errors
detected" newtestoutput.txt; then; ./arun 3build6; else; printf "bad
compile\n"; end if;

result: if: Expression Syntax.

note: the compile Was a success - the newtestoutput file Was
generated... but i don't believe that text string was compared in
either version before the error msg was triggered. i see what you
meant about simplifying - but in this case, i absolutly must have some
sort of string comparision to active the IF/ELSE statements.

also - if you have time, please briefly tell me what dev/null/ is for.
(btw, my computer is mac osx 2. Cool

thank you
martin

martin · *nix forums beginner Joined: 22 Feb 2005 Posts: 44

sorry about that... when i get home in this afternoon, i'll try it out
- and then i'll be able to cut/paste with my question again by
mid-afternoon.
thanks.
martin

Chris F.A. Johnson · *nix forums Guru Joined: 20 Feb 2005 Posts: 2268

On Mon, 07 Feb 2005 at 12:32 GMT, martin wrote:

martin · *nix forums beginner Joined: 22 Feb 2005 Posts: 44

Thanks for writing back (everyone). I'm so new to unix and terminal
that i haven't yet figured out how to do two things -(among about a
million other things Smile

one - type multi line commands into the terminal w/out terminal wanting
to process the first line after hitting return... or setting up a code
file for terminal to fetch to collect statements to run
and, two - how to just type the code you wrote above on one line using
";" to seperate each command.

since i think it'll be easier to put it all in one line (as i'm going
to have to have applescript send that line to terminal) could you
possibly re-type what you wrote above, and show me the format for doing
it all in one command line? when i tried last night, i kept getting
errors about how the ( ) were in the wrong place - (some examples i'd
seen used curly braces and ( ) and i was trying to follow that
syntax...)

i would really appreciate being able to see both side-by-side.
thanks so much!
martin

Ed Morton · *nix forums Guru Joined: 20 Feb 2005 Posts: 1073

martin wrote:

Chris F.A. Johnson · *nix forums Guru Joined: 20 Feb 2005 Posts: 2268

On Mon, 07 Feb 2005 at 01:19 GMT, martin wrote:

martin · *nix forums beginner Joined: 22 Feb 2005 Posts: 44

i'm trying to figure out the syntax for building an awk statement that
will check the output of text in a file generated after attempting to
compile a source code file. i'm new to unix and don't know how to
issue statements to terminal if they're embedded inside an if/then
control statement.

../alan 3build6.alan > alan_output.txt ; awk (if ~/No warnings or errors
detected/ printf ./arun 3build6); else print "compile wasn't a success"

i'm trying to tell terminal to run the executable file by issuing a
command "./arun 3build6" if the string "No warnings or errors detected"
exists in the alan_output.txt file. once i understand that - i'd also
like to add some other more sophisticated commands in the "else"
portion of the code... but for now, i was just using the "compile
wasn't a success" as a way of checking the code's functionality.

i found on some of the awk pages that some examples used the printf
command - but i don't know what that does. i do now want - or do not
need for: "./arun 3build6" to be printed to the terminal screen unless
it will be printed into a command line, with the equivilant of hitting
the return button to execute it.

any wisdom would really be appreciated. :)

thank you.
martin

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