Help in writing script

Shell Programming and Scripting
1

i need some help in donig some actions on files in a library.
i want to get the n last files, and print to the screen their name, date, and how many times a specific string appears in each file..

how can i do this..?...

2

How many total files? Something like "ls -lt <list>" has limits on most systems. Once you have the file names and dates, grep -c counts lines with pattern.

3

Try this one:

ls | tail -5 > /tmp/tot.txt
astring=ball

    for i in `cat /tmp/tot.txt`
     do
        a=`cat $i | grep $astring | wc -l`
        echo " There are $a $astring in the file $i"
     done
4

Narrative: Suppose I am searching for 'printf(' family calls in my C source directory 'mysrc'.

  1. I open a subshell (...) so I am not changing the $PWD of the caller when I cd.
  2. I put those two parameters into variables.
  3. I list all the c files, newest first,
  4. into sed, which substitutes for beginning of line ^ not-space [^ ] any number of times * one space (5 times) then capturing \(..\) up to the last space as one field (the time part, but this does not work well for ls -l on sym links, just simple files) and everything else (the file name) as the second field. Sed throws away the first 5 fields (not captured), rewrites the two fields into an echo command with an embedded grep -c to count the references, a tab to accommodate varying number width from grep -c, and the captured fields.
  5. sed quits after converting 20 lines.
  6. The dynamically created script goes into ksh.
 
(
export   astring="printf("   lib_dir=mysrc 
cd $lib_dir
ls -lt *.c | sed '
  s/^[^ ]* *[^ ]* *[^ ]* *[^ ]* *[^ ]* *\(.*\) \(.*\)/echo $( grep -c "'"$astring"'" <\2 )"     \1 \2"/
  20q
 ' | ksh
)
1       Nov 18 17:20 pctbin.c
4       Nov 12 12:13 xdemux.c
2       Nov 12 11:32 fgets_eof.c
0       Nov 10 16:58 cps.c
0       Nov  3 09:30 tps.c
0       Nov  3 09:14 tcs.c
0       Oct 28 14:24 usleep2.c
0       Oct 18 11:03 allwait.c
1       Oct 15 16:58 fwcl.c
4       Oct 14 14:25 fxargs2.c
10      Oct 14 12:20 tm2tm.c
12      Oct 14 10:35 autotab.c
5       Jul 23 15:25 undelim.c
0       Jun 15 12:36 lineso2.c
0       Jun 15 11:03 lineso.c
2       Jun  3 10:52 realpath.c
0       May 28 10:28 pt2h.c
0       May 25 08:57 ghead.c
32      May 25 08:54 string_functions.c
1       May 25 08:54 psal.c
5

first of all thank you very much for the help...
second, DGPickett, if you can explain me the commands you write it will be great...

6

Sure, see above.

7

thank you very much!!! :b: