在linux下，如何将shell里输出的信息写入到文件里呢？

在linux下，如何将shell里输出的信息写入到文件里呢？
通过下面的两个管道符可以实现些功能。

> 将信息写入文件

>> 在现有文件中追加信息

如：
linux-a9c6:~ # ps -A
PID TTY TIME CMD
1 ? 00:00:01 init
2 ? 00:00:00 kthreadd
3 ? 00:00:00 migration/0
4 ? 00:00:02 ksoftirqd/0
5 ? 00:00:00 watchdog/0
6 ? 00:00:00 migration/1
7 ? 00:00:06 ksoftirqd/1
8 ? 00:00:00 watchdog/1
9 ? 00:00:00 events/0
10 ? 00:00:00 events/1
11 ? 00:00:00 cpuset
12 ? 00:00:00 khelper
13 ? 00:00:00 netns
14 ? 00:00:00 async/mgr
15 ? 00:00:00 kintegrityd/0
16 ? 00:00:00 kintegrityd/1
17 ? 00:00:00 kblockd/0
18 ? 00:00:00 kblockd/1
19 ? 00:00:00 kacpid
20 ? 00:00:00 kacpi_notify
21 ? 00:00:00 ksuspend_usbd
22 ? 00:00:00 khubd
23 ? 00:00:00 kseriod
24 ? 00:00:00 kondemand/0
25 ? 00:00:00 kondemand/1
26 ? 00:00:00 khungtaskd
27 ? 00:00:00 pdflush
28 ? 00:00:00 pdflush
29 ? 00:00:00 kswapd0
30 ? 00:00:00 aio/0
31 ? 00:00:00 aio/1
32 ? 00:00:00 crypto/0
33 ? 00:00:00 crypto/1
36 ? 00:00:00 kpsmoused
64 ? 00:00:00 ata/0
65 ? 00:00:00 ata/1
66 ? 00:00:00 ata_aux
67 ? 00:00:00 scsi_eh_0
68 ? 00:00:00 scsi_eh_1
69 ? 00:00:00 scsi_eh_2
70 ? 00:00:00 scsi_eh_3
71 ? 00:00:01 scsi_eh_4
72 ? 00:00:00 scsi_eh_5
619 ? 00:00:00 kjournald2
715 ? 00:00:00 udevd
1125 ? 00:00:00 kmmcd
1145 ? 00:00:00 kmemstick
1306 ? 00:00:00 usbhid_resumer
1429 ? 00:00:00 hd-audio0
1528 ? 00:00:00 kauditd
1542 ? 00:00:00 kstriped
1627 ? 00:00:00 kjournald2
2089 ? 00:00:00 acpid
2106 ? 00:00:00 klogd
2110 ? 00:00:00 syslog-ng
2111 ? 00:00:01 dbus-daemon
2134 ? 00:00:00 gdm
2142 ? 00:00:00 startpar
2298 ? 00:00:00 gdm-simple-slav
2325 tty7 00:16:08 Xorg
2517 ? 00:00:00 nmbd
2704 ? 00:00:00 rpcbind
2732 ? 00:00:00 kconservative/0
2734 ? 00:00:00 kconservative/1
2746 ? 00:00:01 hald
2800 ? 00:00:00 console-kit-dae
2863 ? 00:00:00 hald-runner
2875 ? 00:00:00 hald-addon-inpu
2902 ? 00:00:00 hald-addon-gene
2921 ? 00:00:02 hald-addon-stor
2923 ? 00:00:00 hald-addon-cpuf
2924 ? 00:00:00 hald-addon-acpi
2997 ? 00:00:00 dbus-launch
3069 ? 00:00:00 avahi-daemon
3148 ? 00:00:00 cupsd
3172 ? 00:00:00 mysqld_safe
3213 ? 00:00:04 mysqld
3321 ? 00:00:00 devkit-power-da
3323 ? 00:00:00 devkit-daemon
3571 ? 00:00:00 httpd2-prefork
3600 ? 00:00:00 mono
3601 ? 00:00:00 httpd2-prefork
3602 ? 00:00:00 httpd2-prefork
3603 ? 00:00:00 httpd2-prefork
3604 ? 00:00:00 httpd2-prefork
3605 ? 00:00:00 httpd2-prefork
3691 ? 00:00:00 nscd
3734 ? 00:00:00 sshd
3772 ? 00:00:00 smartd
3802 ? 00:00:00 smbd
3815 ? 00:00:00 master
3849 ? 00:00:00 smbd
3861 ? 00:00:00 cron
3943 ? 00:00:00 gdm-session-wor
3976 tty1 00:00:00 mingetty
3977 tty2 00:00:00 mingetty
3978 tty3 00:00:00 mingetty
3982 tty4 00:00:00 mingetty
3983 tty5 00:00:00 mingetty
3986 tty6 00:00:00 mingetty
4023 ? 00:00:00 gnome-keyring-d
4039 ? 00:00:00 gnome-session
4138 ? 00:00:02 scim-launcher
4145 ? 00:00:00 scim-launcher
4184 ? 00:00:00 gpg-agent
4185 ? 00:00:00 ssh-agent
4196 ? 00:00:00 dbus-launch
4197 ? 00:00:00 dbus-daemon
4200 ? 00:00:01 gconfd-2
4204 ? 00:00:02 gnome-settings-
4212 ? 00:00:00 gvfsd
4217 ? 00:00:00 gvfs-fuse-daemo
4226 ? 00:00:11 metacity
4230 ? 00:00:21 gnome-panel
4231 ? 00:00:34 nautilus
4237 ? 00:00:00 gvfs-hal-volume
4239 ? 00:00:00 gvfs-gphoto2-vo
4244 ? 00:00:00 bluetooth-apple
4245 ? 00:00:00 python
4251 ? 00:00:00 gnome-volume-co
4252 ? 00:00:00 gpk-update-icon
4267 ? 00:01:32 pulseaudio
4271 ? 00:00:00 nm-applet
4281 ? 00:00:00 gnome-power-man
4282 ? 00:00:00 bluetoothd
4296 ? 00:00:00 bluetooth
4302 ? 00:00:00 gconf-helper
4309 ? 00:00:00 krfcommd
4365 ? 00:00:00 bonobo-activati
4419 ? 00:00:00 nm-system-setti
4429 ? 00:00:00 gvfsd-trash
4446 ? 00:00:01 tomboy
4448 ? 00:00:01 mini_commander_
4466 ? 00:00:00 gvfsd-burn
4485 ? 00:00:01 scim-bridge
4490 ? 00:00:00 mount.ntfs-3g
4503 ? 00:00:00 mount.ntfs-3g
4510 ? 00:00:00 mount.ntfs-3g
4520 ? 00:00:00 mount.ntfs-3g
4527 ? 00:00:02 gnome-screensav
4532 ? 00:00:00 gvfsd-computer
4845 ? 00:00:04 wineserver
4848 ? 00:00:00 services.exe
4850 ? 00:00:00 winedevice.exe
4858 ? 00:00:01 iexplore.exe
4860 ? 00:00:00 explorer.exe
7980 ? 00:00:00 scim-helper-man
7981 ? 00:00:03 scim-panel-gtk
8299 ? 00:00:00 pickup
8308 ? 00:00:00 qmgr
8793 ? 00:00:00 firefox
8798 ? 00:05:23 firefox
9070 ? 00:00:00 gnome-terminal
9071 ? 00:00:00 gnome-pty-helpe
9072 pts/0 00:00:00 bash
9097 pts/0 00:00:00 ps
linux-a9c6:~ # ps -A > /root/1.txt
linux-a9c6:~ # ls | find 1.txt
1.txt
linux-a9c6:~ #

本文出自 “好事成双” 博客，请务必保留此出处http://daven.blog.51cto.com/18445/175244