cat
cat 은 고양이의 켓이 아니라 보여달라는 리눅스의 명령어이다.
cat은 혼자 쓰이기도 하지만 보통은 여러가지 부수적인 명령어와 같이 쓰인다.
그 명령어들은 grep, |, >, less, more 등 여러가지가 있다.
[dangerzo@dangerzo dangerzo]$ ls
abab good want_3 want_4 want_5 want_6 wanted_1
[dangerzo@dangerzo dangerzo]$ cat good <- good 파일을 보여줘~!~!
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 13:34 ? 00:00:04 init
root 2 1 0 13:34 ? 00:00:00 [keventd]
root 3 1 0 13:34 ? 00:00:00 [kapmd]
root 4 1 0 13:34 ? 00:00:00 [ksoftirqd_CPU0]
root 9 1 0 13:34 ? 00:00:00 [bdflush]
root 5 1 0 13:34 ? 00:00:00 [kswapd]
root 6 1 0 13:34 ? 00:00:00 [kscand/DMA]
root 7 1 0 13:34 ? 00:00:00 [kscand/Normal]
root 8 1 0 13:34 ? 00:00:00 [kscand/HighMem]
root 10 1 0 13:34 ? 00:00:00 [kupdated]
root 11 1 0 13:34 ? 00:00:00 [mdrecoveryd]
root 15 1 0 13:34 ? 00:00:00 [kjournald]
root 73 1 0 13:34 ? 00:00:00 [khubd]
root 1258 1 0 13:34 ? 00:00:00 [kjournald]
root 1259 1 0 13:34 ? 00:00:00 [kjournald]
root 1571 1 0 13:35 ? 00:00:00 syslogd -m 0
root 1575 1 0 13:35 ? 00:00:00 klogd -x
rpc 1585 1 0 13:35 ? 00:00:00 [portmap]
rpcuser 1604 1 0 13:35 ? 00:00:00 [rpc.statd]
root 1671 1 0 13:35 ? 00:00:00 /usr/sbin/apmd -p 10 -w 5 -W -P
root 1721 1 0 13:35 ? 00:00:00 /usr/sbin/sshd
root 1735 1 0 13:35 ? 00:00:00 xinetd -stayalive -reuse -pidfil
root 1771 1 0 13:35 ? 00:00:00 [sendmail]
smmsp 1780 1 0 13:35 ? 00:00:00 [sendmail]
root 1790 1 0 13:35 ? 00:00:00 gpm -t imps2 -m /dev/mouse
root 1799 1 0 13:35 ? 00:00:00 crond
root 1810 1 0 13:35 ? 00:00:00 cupsd
daemon 1860 1 0 13:35 ? 00:00:00 [atd]
root 1869 1 0 13:35 tty2 00:00:00 /sbin/mingetty tty2
root 1870 1 0 13:35 tty3 00:00:00 /sbin/mingetty tty3
root 1871 1 0 13:35 tty4 00:00:00 /sbin/mingetty tty4
root 1872 1 0 13:35 tty5 00:00:00 /sbin/mingetty tty5
root 1873 1 0 13:35 tty6 00:00:00 /sbin/mingetty tty6
root 15227 1 0 14:49 ? 00:00:00 [login]
dangerzo 15228 15227 0 14:50 tty1 00:00:00 -bash
root 15337 15228 0 14:54 tty1 00:00:00 [su]
root 15338 15337 0 14:54 tty1 00:00:00 -bash
root 15388 15338 0 15:00 tty1 00:00:00 ps -ef
[dangerzo@dangerzo dangerzo]$
[dangerzo@dangerzo dangerzo]$ cat good | less <- good 파일을 보여줘 그런대 잘라서보여줘
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 13:34 ? 00:00:04 init
root 2 1 0 13:34 ? 00:00:00 [keventd]
root 3 1 0 13:34 ? 00:00:00 [kapmd]
root 4 1 0 13:34 ? 00:00:00 [ksoftirqd_CPU0]
root 9 1 0 13:34 ? 00:00:00 [bdflush]
root 5 1 0 13:34 ? 00:00:00 [kswapd]
root 6 1 0 13:34 ? 00:00:00 [kscand/DMA]
root 7 1 0 13:34 ? 00:00:00 [kscand/Normal]
root 8 1 0 13:34 ? 00:00:00 [kscand/HighMem]
root 10 1 0 13:34 ? 00:00:00 [kupdated]
root 11 1 0 13:34 ? 00:00:00 [mdrecoveryd]
root 15 1 0 13:34 ? 00:00:00 [kjournald]
root 73 1 0 13:34 ? 00:00:00 [khubd]
root 1258 1 0 13:34 ? 00:00:00 [kjournald]
root 1259 1 0 13:34 ? 00:00:00 [kjournald]
root 1571 1 0 13:35 ? 00:00:00 syslogd -m 0
root 1575 1 0 13:35 ? 00:00:00 klogd -x
rpc 1585 1 0 13:35 ? 00:00:00 [portmap]
rpcuser 1604 1 0 13:35 ? 00:00:00 [rpc.statd]
root 1671 1 0 13:35 ? 00:00:00 /usr/sbin/apmd -p 10 -w 5 -W -P
root 1721 1 0 13:35 ? 00:00:00 /usr/sbin/sshd
root 1735 1 0 13:35 ? 00:00:00 xinetd -stayalive -reuse -pidfil
:
[dangerzo@dangerzo dangerzo]$ cat good <- good 파일을 보여줘
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 13:34 ? 00:00:04 init
root 2 1 0 13:34 ? 00:00:00 [keventd]
root 3 1 0 13:34 ? 00:00:00 [kapmd]
root 4 1 0 13:34 ? 00:00:00 [ksoftirqd_CPU0]
root 9 1 0 13:34 ? 00:00:00 [bdflush]
root 5 1 0 13:34 ? 00:00:00 [kswapd]
root 6 1 0 13:34 ? 00:00:00 [kscand/DMA]
root 7 1 0 13:34 ? 00:00:00 [kscand/Normal]
root 8 1 0 13:34 ? 00:00:00 [kscand/HighMem]
root 10 1 0 13:34 ? 00:00:00 [kupdated]
root 11 1 0 13:34 ? 00:00:00 [mdrecoveryd]
root 15 1 0 13:34 ? 00:00:00 [kjournald]
root 73 1 0 13:34 ? 00:00:00 [khubd]
root 1258 1 0 13:34 ? 00:00:00 [kjournald]
root 1259 1 0 13:34 ? 00:00:00 [kjournald]
root 1571 1 0 13:35 ? 00:00:00 syslogd -m 0
root 1575 1 0 13:35 ? 00:00:00 klogd -x
rpc 1585 1 0 13:35 ? 00:00:00 [portmap]
rpcuser 1604 1 0 13:35 ? 00:00:00 [rpc.statd]
root 1671 1 0 13:35 ? 00:00:00 /usr/sbin/apmd -p 10 -w 5 -W -P
root 1721 1 0 13:35 ? 00:00:00 /usr/sbin/sshd
root 1735 1 0 13:35 ? 00:00:00 xinetd -stayalive -reuse -pidfil
root 1771 1 0 13:35 ? 00:00:00 [sendmail]
smmsp 1780 1 0 13:35 ? 00:00:00 [sendmail]
root 1790 1 0 13:35 ? 00:00:00 gpm -t imps2 -m /dev/mouse
root 1799 1 0 13:35 ? 00:00:00 crond
root 1810 1 0 13:35 ? 00:00:00 cupsd
daemon 1860 1 0 13:35 ? 00:00:00 [atd]
root 1869 1 0 13:35 tty2 00:00:00 /sbin/mingetty tty2
root 1870 1 0 13:35 tty3 00:00:00 /sbin/mingetty tty3
root 1871 1 0 13:35 tty4 00:00:00 /sbin/mingetty tty4
root 1872 1 0 13:35 tty5 00:00:00 /sbin/mingetty tty5
root 1873 1 0 13:35 tty6 00:00:00 /sbin/mingetty tty6
root 15227 1 0 14:49 ? 00:00:00 [login]
dangerzo 15228 15227 0 14:50 tty1 00:00:00 -bash
root 15337 15228 0 14:54 tty1 00:00:00 [su]
root 15338 15337 0 14:54 tty1 00:00:00 -bash
root 15388 15338 0 15:00 tty1 00:00:00 ps -ef
[dangerzo@dangerzo dangerzo]$ cat good | grep sbin <- good 파일을 보여줘 그리고 sbin d이라는 부분이 들어간 곳이 있는 것만 보여줘
root 1671 1 0 13:35 ? 00:00:00 /usr/sbin/apmd -p 10 -w 5 -W -P
root 1721 1 0 13:35 ? 00:00:00 /usr/sbin/sshd
root 1869 1 0 13:35 tty2 00:00:00 /sbin/mingetty tty2
root 1870 1 0 13:35 tty3 00:00:00 /sbin/mingetty tty3
root 1871 1 0 13:35 tty4 00:00:00 /sbin/mingetty tty4
root 1872 1 0 13:35 tty5 00:00:00 /sbin/mingetty tty5
root 1873 1 0 13:35 tty6 00:00:00 /sbin/mingetty tty6
[dangerzo@dangerzo dangerzo]$
[dangerzo@dangerzo dangerzo]$ ls
abab good want_3 want_4 want_5 want_6 wanted_1
[dangerzo@dangerzo dangerzo]$ cat good | grep sbin > grep.txt -> sbin이 들어간곳만 있는것을 보여준 것을 grep.txt 라는 파일로 만들어줘
[dangerzo@dangerzo dangerzo]$ ls
abab good grep.txt want_3 want_4 want_5 want_6 wanted_1
[dangerzo@dangerzo dangerzo]$ cat good
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 13:34 ? 00:00:04 init
root 2 1 0 13:34 ? 00:00:00 [keventd]
root 3 1 0 13:34 ? 00:00:00 [kapmd]
root 4 1 0 13:34 ? 00:00:00 [ksoftirqd_CPU0]
root 9 1 0 13:34 ? 00:00:00 [bdflush]
root 5 1 0 13:34 ? 00:00:00 [kswapd]
root 6 1 0 13:34 ? 00:00:00 [kscand/DMA]
root 7 1 0 13:34 ? 00:00:00 [kscand/Normal]
root 8 1 0 13:34 ? 00:00:00 [kscand/HighMem]
root 10 1 0 13:34 ? 00:00:00 [kupdated]
root 11 1 0 13:34 ? 00:00:00 [mdrecoveryd]
root 15 1 0 13:34 ? 00:00:00 [kjournald]
root 73 1 0 13:34 ? 00:00:00 [khubd]
root 1258 1 0 13:34 ? 00:00:00 [kjournald]
root 1259 1 0 13:34 ? 00:00:00 [kjournald]
root 1571 1 0 13:35 ? 00:00:00 syslogd -m 0
root 1575 1 0 13:35 ? 00:00:00 klogd -x
rpc 1585 1 0 13:35 ? 00:00:00 [portmap]
rpcuser 1604 1 0 13:35 ? 00:00:00 [rpc.statd]
root 1671 1 0 13:35 ? 00:00:00 /usr/sbin/apmd -p 10 -w 5 -W -P
root 1721 1 0 13:35 ? 00:00:00 /usr/sbin/sshd
root 1735 1 0 13:35 ? 00:00:00 xinetd -stayalive -reuse -pidfil
root 1771 1 0 13:35 ? 00:00:00 [sendmail]
smmsp 1780 1 0 13:35 ? 00:00:00 [sendmail]
root 1790 1 0 13:35 ? 00:00:00 gpm -t imps2 -m /dev/mouse
root 1799 1 0 13:35 ? 00:00:00 crond
root 1810 1 0 13:35 ? 00:00:00 cupsd
daemon 1860 1 0 13:35 ? 00:00:00 [atd]
root 1869 1 0 13:35 tty2 00:00:00 /sbin/mingetty tty2
root 1870 1 0 13:35 tty3 00:00:00 /sbin/mingetty tty3
root 1871 1 0 13:35 tty4 00:00:00 /sbin/mingetty tty4
root 1872 1 0 13:35 tty5 00:00:00 /sbin/mingetty tty5
root 1873 1 0 13:35 tty6 00:00:00 /sbin/mingetty tty6
root 15227 1 0 14:49 ? 00:00:00 [login]
dangerzo 15228 15227 0 14:50 tty1 00:00:00 -bash
root 15337 15228 0 14:54 tty1 00:00:00 [su]
root 15338 15337 0 14:54 tty1 00:00:00 -bash
root 15388 15338 0 15:00 tty1 00:00:00 ps -ef
[dangerzo@dangerzo dangerzo]$ cat grep.txt
root 1671 1 0 13:35 ? 00:00:00 /usr/sbin/apmd -p 10 -w 5 -W -P
root 1721 1 0 13:35 ? 00:00:00 /usr/sbin/sshd
root 1869 1 0 13:35 tty2 00:00:00 /sbin/mingetty tty2
root 1870 1 0 13:35 tty3 00:00:00 /sbin/mingetty tty3
root 1871 1 0 13:35 tty4 00:00:00 /sbin/mingetty tty4
root 1872 1 0 13:35 tty5 00:00:00 /sbin/mingetty tty5
root 1873 1 0 13:35 tty6 00:00:00 /sbin/mingetty tty6
[dangerzo@dangerzo dangerzo]$ ls
abab good grep.txt want_3 want_4 want_5 want_6 wanted_1
[dangerzo@dangerzo dangerzo]$
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