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Top Forums UNIX for Dummies Questions & Answers How to improve the performance of this script? Post 302865531 by Yoda on Friday 18th of October 2013 05:29:25 PM
Old 10-18-2013
You are using way too many external commands in your script which is causing it to slow down.

I would recommend using shell built-ins where ever possible to improve your script performance.

Here is an approach using ksh93 using only shell built-ins:
Code:
#!/bin/ksh93

while read line
do
        for word in $line
        do
                if [[ $word == +([0-9])\/+([0-9])\/+([0-9]) ]]
                then
                        tmp=$( printf "%(%Y-%m-%d)T" "$word" )
                        [[ -z "$str" ]] && str="$tmp" || str="$str $tmp"
                else
                        [[ -z "$str" ]] && str="$word" || str="$str $word"
                fi
        done
        printf "%s\n" "$str"
        str=""
done < file


Last edited by Yoda; 10-18-2013 at 06:35 PM.. Reason: replaced print with printf
 

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curs_instr(3X)															    curs_instr(3X)

NAME
instr, innstr, winstr, winnstr, mvinstr, mvinnstr, mvwinstr, mvwinnstr - get a string of characters from a curses window SYNOPSIS
#include <curses.h> int instr(char *str); int innstr(char *str, int n); int winstr(WINDOW *win, char *str); int winnstr(WINDOW *win, char *str, int n); int mvinstr(int y, int x, char *str); int mvinnstr(int y, int x, char *str, int n); int mvwinstr(WINDOW *win, int y, int x, char *str); int mvwinnstr(WINDOW *win, int y, int x, char *str, int n); DESCRIPTION
These routines return a string of characters in str, extracted starting at the current cursor position in the named window. Attributes are stripped from the characters. The four functions with n as the last argument return a leading substring at most n characters long (exclu- sive of the trailing NUL). RETURN VALUE
All of the functions return ERR upon failure, or the number of characters actually read into the string. X/Open defines no error conditions. In this implementation, if the window parameter is null or the str parameter is null, a zero is returned. NOTES
Note that all routines except winnstr may be macros. PORTABILITY
SVr4 does not document whether a length limit includes or excludes the trailing NUL. The ncurses library extends the XSI description by allowing a negative value for n. In this case, the functions return the string ending at the right margin. SEE ALSO
curses(3X). curs_instr(3X)
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