Question

Can someone please help me with the piping of the following code. The Myshell is a command language interpreter which can execute several internal commands as well as some external command using a default Linux shell. The command can be read from either standard input or a batch file.

This program currently executes commands such as ls>1, sort myshell.c >2. What I need it the to pipe the commands so i can execute commands like ls | 1 or

sort < myshell.c | grep main | cat > output

ive posted my current un-piped code here:

https://github.com/davidsmith628/my-shell/blob/master/my%20shell

Answer 1

Hi,

If you want to pipe the commands  ls | 1 or sort < myshell.c | grep main | cat > output, use a back slash(\) before the pipe so that if pipe symbol '|' has a special meaning in case it will be neglected and considered as a pipe. Also make sure that you give a space after ls and after pipe

correct usage: ls \| l

incorrect usage: ls | l

ls\|l

Thankyou