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echo 'a' | nawk -f parks.awk
echo 'a' | nawk -v shift=4 -f parks.awk parks.awk:

function initascii2dec()
{
for(i=0;i<=255;i++) {
ch=sprintf("%c", i)
ascii2dec[ch] = i
}
}...

#include <stdio.h>

int main(int argc, char **argv ) {
if ( *argv[1] == 'z' ) *argv[1]=64;
printf( "%c\n", *argv[1]+1 );
return 0;
}



$ cc -o mytest mypoorc.c

$ ./mytest a
b
...