output 모음.txt

root@DESKTOP-Q3B541T:~# gcc --version
gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

root@DESKTOP-Q3B541T:~# gcc -o simplesh simplesh.c
root@DESKTOP-Q3B541T:~# ./simplesh
simplesh:/root$ gcc
gcc: fatal error: no input files
compilation terminated.
simplesh:/root$ ls -ald /tmp
drwxrwxrwt 2 root root 4096 May 14 14:51 /tmp
simplesh:/root$ /usr/bin/ls -ald /tmp
drwxrwxrwt 2 root root 4096 May 14 14:51 /tmp
simplesh:/root$ asdf
Failed to exec: No such file or directory
simplesh:/root$ /asdf
Failed to exec: No such file or directory
simplesh:/root$ pwd
/root
simplesh:/root$ pwd test
simplesh: pwd: too many arguments
simplesh:/root$ cd /root
simplesh: cd: /root: Permission denied
simplesh:/root$ cd /asdf
simplesh: cd: /asdf: No such file or directory
simplesh:/root$ cd /tmp
simplesh:/tmp$ cd
simplesh: cd: no arguments
simplesh:/tmp$ cd /tmp /usr
simplesh: cd: too many arguments
simplesh:/tmp$ cd ..
simplesh:/$ pwd
/
simplesh:/$ exit 1 2 3
simplesh: exit: too many arguments
simplesh:/$ exit
root@DESKTOP-Q3B541T:~# echo $?
0
root@DESKTOP-Q3B541T:~# ./simplesh
simplesh:/root$ exit 1
root@DESKTOP-Q3B541T:~# echo $?
1
root@DESKTOP-Q3B541T:~# gcc -o simplesh simplesh.c
root@DESKTOP-Q3B541T:~# ./simplesh
simplesh:/root$ ls -ald /tmp > out
simplesh:/root$ cat out
drwxrwxrwt 2 root root 4096 May 14 14:52 /tmp
simplesh:/root$ ls -ald /tmp >> out
simplesh:/root$ cat out
drwxrwxrwt 2 root root 4096 May 14 14:52 /tmp
drwxrwxrwt 2 root root 4096 May 14 14:52 /tmp
simplesh:/root$ ls -ald /usr > out
simplesh:/root$ cat out
drwxr-xr-x 14 root root 4096 Aug  5  2020 /usr
simplesh:/root$ ls -ald /usr > /root/out
Failed to open file for stdout redirection: Permission denied
simplesh:/root$ ls -ald /usr > /asdf/out
Failed to open file for stdout redirection: No such file or directory
simplesh:/root$ exit
root@DESKTOP-Q3B541T:~#