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Full Discussion: Help in writing script
Top Forums Shell Programming and Scripting Help in writing script Post 302473371 by DGPickett on Friday 19th of November 2010 04:25:27 PM
Old 11-19-2010
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.
Code:
 
(
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

Last edited by DGPickett; 11-20-2010 at 12:25 PM..
 

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LEARN ABOUT MINIX

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)
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