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Hello all! I am new to unix scripting and I am trying to learn a few things by writing in unix scripts utility programs I wrote in other languages. Here is where I am currently stumped: I would like to delete files older than "X" generations. By that I mean if in a given directory there are 10...

Hi all, This newbie needs some help. I've been playing with AWK and SED and am trying to figure out how to replace all non-printable characters with a "." Actually, can someone tell me how in AWK or SED, I can replace any ASCII characters in the range of 0 - 31 (x0 - x1F), but not the line feed...

Hi all, I am a bit stuck here with a seemingly simple process: How do I split a file of say X records into n files each file having X/n records? So if I have a 30,000 record file, how can I split the file into 3 files with each file containing 10,000 records? Thanks for helping out the newbie...

Hello everyone, When i try to download a file from a server to my laptop via AFP (Apple File Protocol over TCP/IP), the file transfer is unbearably SLOW. Transferring a 1 meg file takes about 2 mins (that's way too slow). However, uploading the same file to the server takes about the time to...

ahh!! CaKiwi, you are a ray of light!! --Bondster!!

Hi CaKiwi, here's my program. Don't know why it prints to STDOUT awk -f Program.awk dataFile.txt # ========= program1.awk ========== outfile = substr($0,9,18) gsub(/ /,"",outfile) {print >>outfile ; close(outfile)} The only way to not get printout on my screen is to redirect STNDOUT...

CaKiwi, {print >>$1) works fine, it writes to the appropriate file, but it also prints to STDOUT (screen). How can I suppress screen printout? Thanks! --Bondster!!

Okay, thanks CaKiwi and Baraka, I got it to work :-) However, in the general sense, my question still lingers. If I wanted to search records of a file, but limiting my search within specific column locations, how would I do it. I am thinking perhaps the function "substr" might do it...

Hi all, how can I match using fixed locations. It seems like AWK allows pattern matching, but I need to match in a fixed position. Ex: FileA.txt contains: aaaaJobCode bbbbb aaaaJobControlbbbbb aaaaJobStatus ccccc eeeeJob dddddd If I want only those records that match "Job...

Hey everyone, newbie #1 still learning awk. I need some help: I have a file, each record contains data and a filename. I want my awk program to append each record to a file whose file name is on that records. For example, if file FILE_A.txt contains: filename_1.txt data data data filename_1.txt...

Okay, after some experimenting I got it to work! It had to do with a subtle change: Instead of: A=`awk '/""$B""/{ print $3 } inFile.txt` I used: A=`awk '/'"$B"'/{ print $3 } inFile.txt` Can someone explain why this works? Thanks!! --Bondster!!

Ed, thank you for your prompt response. I tried the double quotes but didn't have much luck. I also tried the link you posted but it just took me back to the tek-tips home page. Any other suggestions would be greatly appreciated!! --Bondster!! P.S. Here is what I am trying to do (with your...

Hi everyone, after some time, I need to revisit this problem. The suggested solution: A=`awk'/HELLO/{ print $3 } inFile.txt` does a fine job of storing the text "b001.txt" in variable A However, suppose instead of hardcoding "HELLO", I wish to use a variable, say $B followed...

Hi all, what's the best way to drop n characters from each record in a given file? The n characters are consecutive, but they could be at the beginning, middle, or end of the record. For example, given file A.txt which has a record length of 1000, how can I get make file B.txt which has a...

Hey thanks Jamisar, I think your simple example clarified the rules behind quoting. Geez, I wish the book I was reading used similar examples. Anyway, I changed my script and it worked well. I'll probably wind up asking for help again in the near future, but I figure with all this practice, It...

Oops! Forgot the "=" in after parm. It should read: PARM='-v fna='"$DIR/$FILE_1"' -f program.awk' It still doesn't work though :-( --Bondster

Hi everyone, I can't seem to get shell quoting correct in a unix script. I tried this command in the command line, and it works great: awk -v file="input1.dat" -f program.awk input2.dat > output.dat but i can't seem to make it work in a script--I've tried a few quoting combination...

Hey CaWiki, thanks for the explanation. So does this mean that the expression in a[] have to evaluate to consecutive characters in the record? Suppose I wanted to do my file comparison based on not just column locations 32-49, but instead, locations 32-38, 41, 47, 49. How to do?? --Bondster...

By the way, can you walk me through your code? I get the jist of the whole thing, but not at a line-by-line level. In your dif.awk script, I see that you loop through the entire fna file (in my case, my A.txt file) and limit your comparison in the desired column locations (via substr($0,32,18))...

Ugh!!! Silly Silly foolish me!!! CaWiki, thanks for all your good help--I found out what was wrong. Your code was impeccable--I was at fault. Here's what I did wrong: I wrote the dif.awk program using Apple's TextEdit program (which of course, adds RTF control characters). When I examined the...