######## Testing basic command execution ######## 
---------------------------------------------------
sh.c
/bin/grep
        fprintf(stderr, "cs111_spring05$ ");
                // error, preceded by 'cs111_spring05: '.
                perror("cs111_spring05: ");
-------------------------------------------------
 
 
 ######## Testing redirection ######## 
---------------------------------------
hello
ls: no_file.txt: No such file or directory
-------------------------------------------------
 
 
 ######## Testing pipes ######## 
---------------------------------
cmdline.c
cmdline.h
cmdline.o
cmdline.c
cmdline.h
cmdline.o
cmdline.c
cmdline.h
cmdline.o
-------------------------------------------------
 
 
 ######## Testing sequential execution ######## 
------------------------------------------------
/bin/grep
sh.c
hello
/bin/grep
sh.c
/bin/grep
sh.c
-------------------------------------------------
 
 
 ######## Testing background ######## 
--------------------------------------
foo
bar
bar
foo
-------------------------------------------------
 
 
 ######## Testing conditional execution ######## 
-------------------------------------------------
/bin/grep
sh.c
Usage: grep [OPTION]... PATTERN [FILE]...
Try `grep --help' for more information.
sh.c
------------------------------------------------------
 
 
 ######## Testing file name matching ######## 
-------------------------------------------------
cmdline.c
cmdline.c
------------------------------------------------------
 
 
 ######## Testing parenthesis ######## 
---------------------------------------
/bin/grep
sh.c
------------------------------------------------------
 
 
 ######## Testing cd ######## 
------------------------------
/
------------------------------------------------------
 
 
 ######## EXIT ########