Shell Programming and Scripting

int runcount(void)
{
        int count=0;
        FILE *fp;
        char path[512];
        const char *homedir=getenv("HOME");

        if(homedir == NULL) return(-1); // If HOME isn't set, we can't find the file!

        // set path to /home/username/.myprogram
        sprintf(path, "%s/.myprogram");
        fp=fopen(path, "w+"); // open .myprogram for reading and writing
        if(fp == NULL) // return a nonsense value if something goes wrong
                return(-1);

        // read a number.  If the file's empty, count will stay zero.
        fscanf(fp, "%d", &count);
        // seek back to the start of the file.
        fseek(fp, 0L, SEEK_SET);
        // overwrite it with count+1.  count+1 will always be a longer
        // string than count so this is safe.
        fprintf(fp, "%d", count+1);
        fclose(fp);
        return(count);
}

#!/bin/bash
log=$HOME/prog$(ls -rt $HOME/prog*.log 2>/dev/null | tail -1 | awk '{gsub(/[a-z.\/]/,"");print $0+1}').log
program.out > $log

#!/bin/bash
log=$HOME/logdir$( ls -trd $HOME/logdir* 2>/dev/null | tail -1 | awk '{gsub(/[a-z.\/]/,"");print $0+1}' )
mkdir $log
program.out > $log/prog.log

% ln -s /aa/bb/cc sl01
% sl01/myprogram

#!/bin/bash
cd /aa/bb/cc

% . ./myscript.sh