Linux grep | ps

1 grep -r 'main' ./ -n

zfang@ubuntu:~/Desktop/test/inet$ grep -r 'main' ./ -n
./server.c:5:int main() {
./client.c:6:int main() {    
Binary file ./server.out matches
Binary file ./client.out matches

2 ps -aux

zfang@ubuntu:~/Desktop/test/inet$ ps -aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.2  23928  4240 ?        Ss   12:55   0:06 /sbin/init auto
root         2  0.0  0.0      0     0 ?        S    12:55   0:00 [kthreadd]
root         3  0.0  0.0      0     0 ?        S    12:55   0:00 [ksoftirqd/0]

3 ps -aux | grep 'kernal'

zfang@ubuntu:~/Desktop/test/inet$ ps -aux | grep 'kernal'
zfang     9692  0.0  0.0   5112   848 pts/2    S+   15:19   0:00 grep --color=auto kernal

4 find ./ -type f | ls -l

zfang@ubuntu:~/Desktop/test/inet$ find ./ -type f | ls -l
total 28
-rw-rw-r-- 1 zfang zfang  704 Mar 12  2023 client.c
-rwxrwxr-x 1 zfang zfang 7720 Mar 12  2023 client.out
-rw-rw-r-- 1 zfang zfang 1029 Mar 12  2023 server.c
-rwxrwxr-x 1 zfang zfang 7860 Mar 12  2023 server.out
drwxrwxr-x 2 zfang zfang 4096 Dec 16 15:26 ts

5 find ./ -type f | xargs ls -l

zfang@ubuntu:~/Desktop/test/inet$ find ./ -type f | xargs ls -l
-rw-rw-r-- 1 zfang zfang  704 Mar 12  2023 ./client.c
-rwxrwxr-x 1 zfang zfang 7720 Mar 12  2023 ./client.out
-rw-rw-r-- 1 zfang zfang 1029 Mar 12  2023 ./server.c
-rwxrwxr-x 1 zfang zfang 7860 Mar 12  2023 ./server.out

6 find ./ -type f -exec ls -l {} \;

zfang@ubuntu:~/Desktop/test/inet$ find ./ -type f -exec ls -l {} \;
-rw-rw-r-- 1 zfang zfang 1029 Mar 12  2023 ./server.c
-rw-rw-r-- 1 zfang zfang 704 Mar 12  2023 ./client.c
-rwxrwxr-x 1 zfang zfang 7860 Mar 12  2023 ./server.out
-rwxrwxr-x 1 zfang zfang 7720 Mar 12  2023 ./client.out

7 find ./ -type f | xargs ls -l

zfang@ubuntu:~/Desktop/test/inet$ find ./ -type f | xargs ls -l
ls: cannot access './abc': No such file or directory
ls: cannot access 'xyz': No such file or directory
-rw-rw-r-- 1 zfang zfang  704 Mar 12  2023 ./client.c
-rwxrwxr-x 1 zfang zfang 7720 Mar 12  2023 ./client.out
-rw-rw-r-- 1 zfang zfang 1029 Mar 12  2023 ./server.c
-rwxrwxr-x 1 zfang zfang 7860 Mar 12  2023 ./server.out

8 find ./ -type f -print0 | xargs -print0 ls -l

zfang@ubuntu:~/Desktop/test/inet$ find ./ -type f -print0 | xargs -print0 ls -l
xargs: WARNING: a NUL character occurred in the input.  It cannot be passed through in the argument list.  Did you mean to use the --null option?
ls -l ?...y
total 28
-rw-rw-r-- 1 zfang zfang    0 Dec 16 15:35 abc xyz
-rw-rw-r-- 1 zfang zfang  704 Mar 12  2023 client.c
-rwxrwxr-x 1 zfang zfang 7720 Mar 12  2023 client.out
-rw-rw-r-- 1 zfang zfang 1029 Mar 12  2023 server.c
-rwxrwxr-x 1 zfang zfang 7860 Mar 12  2023 server.out
drwxrwxr-x 2 zfang zfang 4096 Dec 16 15:26 ts

9 find ../ -size +1k -size -10k -print0 | xargs -print0 ls -l -print0 ls -l

zfang@ubuntu:~/Desktop/test/inet$ find ../ -size +1k -size -10k -print0 | xargs -print0 ls -l
xargs: WARNING: a NUL character occurred in the input.  It cannot be passed through in the argument list.  Did you mean to use the --null option?
ls -l ?...y
total 28
-rw-rw-r-- 1 zfang zfang    0 Dec 16 15:35 abc xyz
-rw-rw-r-- 1 zfang zfang  704 Mar 12  2023 client.c
-rwxrwxr-x 1 zfang zfang 7720 Mar 12  2023 client.out
-rw-rw-r-- 1 zfang zfang 1029 Mar 12  2023 server.c
-rwxrwxr-x 1 zfang zfang 7860 Mar 12  2023 server.out
drwxrwxr-x 2 zfang zfang 4096 Dec 16 15:26 ts