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You might want to try tackling this in parts rather than slaping the whole giant thing together as one glob and hoping it works. Use a tiny test image, print out some values, calculate by hand the...

Depends entirely what you're write() ing to. write() is not a function like printf which always goes to the same place, write() writes to what you tell it to. Without seeing your code I don't know...

nooo. you do need to loop to accept new connections. maybe something like (untested):


while (1) /* Loop forever */
{
/* Accept a client connection */
clientFd = accept(serverFd,...

awk -F: '$4<=10 {print $1, $4}' OFS=: BookDB.txt

Almost always use quotes around variables. And you need arithmetic operators for arithmetic comparison and you need quote them (because of shell redirection operators). So try:
[ "$qtyA" \< 3 ]
PS...

If you want to do it with one variable, try this out:

awk -F: -vOFS=", " -vt="$fieldA" '
BEGIN{n=split(t,words," ")} #split fieldA into words
{flag=1;
for(i=1;i<=n;i++)
if($0 !~...

Your problem is still with the "sed":
sed "s/$current/$change/g" ...

awk -F: | set field separator to ":"
-vOFS=", " | set output field separator to ", "
-vt="$title" | set AWK's variable "t" to the value of shell's variable "$title"
'$0~t | match current line...

awk -F: -vOFS=", " -vt="$title" '$0~t{$3="$"$3;print}' book.txt

https://www.unix.com/unix-dummies-questions-answers/153097-deleting-removing-sentence-txt.html