This project incorporates all topics covered in the ALX-low_level_programming so far, and marks the conclusion of the section of the first trimester of the programme.

Only use the following functions and system calls:

access (man 2 access)
chdir (man 2 chdir)
close (man 2 close)
closedir (man 3 closedir)
execve (man 2 execve)
exit (man 3 exit)
_exit (man 2 _exit)
fflush (man 3 fflush)
fork (man 2 fork)
free (man 3 free)
getcwd (man 3 getcwd)
getline (man 3 getline)
getpid (man 2 getpid)
isatty (man 3 isatty)
kill (man 2 kill)
malloc (man 3 malloc)
open (man 2 open)
opendir (man 3 opendir)
perror (man 3 perror)
read (man 2 read)
readdir (man 3 readdir)
signal (man 2 signal)
stat (__xstat) (man 2 stat)
lstat (__lxstat) (man 2 lstat)
fstat (__fxstat) (man 2 fstat)
strtok (man 3 strtok)
wait (man 2 wait)
waitpid (man 2 waitpid)
wait3 (man 2 wait3)
wait4 (man 2 wait4)
write (man 2 write)

gcc -Wall -Wextra -Werror -pedantic -g *.c -o hsh

-g is used for tracing Valgrind errors.

Shell should work like this oin interactive mode:

$ ./hsh
($) /bin/ls
hsh main.c shell.c
($)
($) exit
$

But also in non-interactive mode:

$ echo "/bin/ls" | ./hsh
hsh main.c shell.c test_ls_2
$
$ cat test_ls_2
/bin/ls
/bin/ls
$
$ cat test_ls_2 | ./hsh
hsh main.c shell.c test_ls_2
hsh main.c shell.c test_ls_2
$

1. set_unset_env.c - Includes functions for setting and unsetting an environment variable.

• find_env - finds the given environmental variable in the linked list.
• _unset_env - Unsets an environmental variable.
• _set_env - Sets an environmental variable.

2. _strtok.c

• t_strlen - Returns token string length for memory allocating.
• t_size - Returns number of delimiters ignoring continuous delimiters.
• ignore_delm - Returns a version of string without preceeding delims.
• _str_tok - Tokenizes a string and returns an array of tokens.

3. _exit.c - Includes functions that enable exiting of the shell.

• c_atoi - Custom atoi converts string to int.
• __exit - Frees user input and then exits main program with a value.