devharsh / APUE-Final

Stevens Institute of Technology - CS 631 - APUE - Final - Simple Shell

APUE-Final

Stevens Institute of Technology - CS 631 - APUE - Final - Simple Shell

NAME

sish —a simple hell

SYNOPSIS

sish [ −x] [ −c command]

DESCRIPTION

sish implements a very simple command-line interpreter or shell. It is suitable to be used interactively or as a login shell. It only implements a very small subset of what would usually be expected of a Unix shell, and does explicitly not lend itself as a scripting language.

Tests

localhost$ ./sish -c date
Mon Dec 16 22:38:53 UTC 2019

localhost$ ./sish -c ls
Makefile  README.md checklist sish      sish.c    sish.h    sish.o

localhost$ ./sish -x

sish$ echo $$
+ echo $$
2797

sish$ echo $?
+ echo $?
0

sish$ pwd
+ pwd
/home/dev/UNIX_programs/FINAL

sish$ cd
+ cd

sish$ pwd
+ pwd
/home/dev

sish$ ls
+ ls
UNIX_programs

sish$ echo $$ > 1.txt
+ echo $$

sish$ cat < 1.txt
+ cat <
2797