File processing of common Linux commands (ii)

Command name: Touch

Location:/bin.touch

Execute Permissions: All Users

[email protected] tmp]# touch list.txt[[email protected] tmp]# touch/root/list.txt[[email protected] tmp]# Touch Program files[[email protected] tmp]# ll total 52drwxr-xr-x 2 root root 4096 12-01 13:05 china-rw-r--r--1 ro OT root 0 12-01 13:43 filesdrwx------3 root root 4096 11-30 19:15 gconfd-root-rw-------1 root root 630 12-01 13:08 g  rub.confdrwx------2 root root 4096 11-30 19:15 keyring-n4kwui-rw-r--r--1 root root 0 12-01 13:36 list.txtsrwxr-xr-x 1 Root root 0 11-30 19:15 mapping-rootdrwx------2 root root 4096 12-01 12:10 orbit-root-rw-r--r--1 root root 0 12-0 1 13:43 program-rw-r--r--1 root root 5 12-01 13:00 [email protected]:0.0srwxr-xr-x 1 root root 0 11-30 20:10 [    EMAIL PROTECTED]:0.0SRW-------1 root root 0 11-30 19:16 scim-helper-manager-socket-rootsrw-------1 root root 0 11-30 19:16 scim-panel-socket:0-rootsrw-------1 root root 0 11-30 19:15 scim-socket-frontend-rootdrwx------2 root R oot 4096 11-30 19:15 SSH-MIBWgs4219drwx------2 root root 4096 11-30 19:15 virtual-root.tyft1adrwxr-xr-x 2 root root 4096 11-30 21:48 VMWARE-CONFIG0DRW XRWXRWT 4 root root 4096 11-30 18:13 vmwarednddrwxr-xr-x 2 root root 4096 11-30 19:13 vmware-rootdrwx------2 root root 40 11-30 19:15 vmware-root-2083992326[[email protected] tmp]# Touch "Profile File" [[email protected] tmp]# Lschinafilesgconfd-rootgrub.confkeyring-n4kwuilist.txtmapping-rootorbit-root Profile fileprogram[email  protected]:0.0[email protected]:0.0scim-helper-manager-socket-rootscim-panel-socket:0- rootscim-socket-frontend-rootssh-mibwgs4219virtual-root.tyft1avmware-config0vmwaredndvmware-rootvmware-root-2083992326  [[email protected] tmp]#

Command name: Cat

Command path:/bin/cat

Execute Permissions: All Users

[Email protected] tmp]# cat/etc/issuered Hat Enterprise Linux Server Release 5.4 (tikanga) Kernel \ R on an \m[[email prot Ected] tmp]# cat-n/etc/issue     1  Red Hat Enterprise Linux Server Release 5.4 (Tikanga)     2  Kernel \ r on an \ M     

Command name: TAC

Location:/usr/bin/tac

[Email protected] tmp]# cat/etc/issuered Hat Enterprise Linux Server Release 5.4 (tikanga) Kernel \ R on an \m[[email prot Ected] tmp]# cat-n/etc/issue     1  Red Hat Enterprise Linux Server Release 5.4 (Tikanga)     2  Kernel \ r on an \ M     3[[email protected] tmp]# [[email protected] tmp]# tac/etc/issuekernel \ r on an \mred Hat Enterprise Linux Server R Elease 5.4 (Tikanga) [[email protected] tmp]# tac-n/ETC/ISSUETAC: Invalid option--N Please try to execute "TAC--help" for more information.

Command name: More can only page down

Location:/bin/more

Space F Q

Command name: Less

Page Up (one page UP)

To collect the cable

Command name: Head, tail

[Email protected] tmp]# head  /etc/services #/etc/services:# $Id: services,v 1.42 2006/02/23 13:09:23 Pknirsch Exp $# # Network Services, Internet style## Note that it's presently the policy of IANA to assign a single well-known# port numb Er for both TCP and UDP; Hence, most entries here has a entries# even if the protocol doesn ' t support UDP operations.# Updated from RFC 1700, ' Assigned Numbers ' (October 1994).  Not all ports# is included, only the more common ones. [Email protected] tmp]# head-1  

[Email protected] tmp]# tail-f  /etc/services  #动态变化nimspooler      48001/udp                       # Nimbus Spoolernimhub          48002/tcp                       # Nimbus Hubnimhub          48002/udp                       # Nimbus HUBNIMGTW          48003/tcp                       # Nimbus          GATEWAYNIMGTW 48003/UDP                       # Nimbus GATEWAYCOM-BARDAC-DW   48556/tcp                       # COM-BARDAC-DWCOM-BARDAC-DW   48556/udp                       # com-bardac-dwiqobject        48619/tcp                       # iqobjectiqobject        48619/udp                       # Iqobject

Command name: LN

Hard links can be updated synchronously, but cannot be partitioned, and hard links cannot be established for the directory

[[email protected] tmp]# ln-s/etc/issue/tmp/issue.soft[[email protected] tmp]# ln  /etc/issue/tmp/issue.hard[[ Email protected] tmp]# ln-l/etc/issueln: Invalid option--L Please try to perform "ln--help" for more information. [[email protected] tmp]# ls-l/etc/issue-rw-r--r--2 root root "2009-08-04/etc/issue[[email protected] tmp]# ls-l/TM p/issue*-rw-r--r--2 root root 2009-08-04/tmp/issue.hardlrwxrwxrwx 1 root root 12-01 14:36/tmp/issue.soft-E Tc/issue[[email protected] tmp]# [[email protected] tmp]# ls-i/etc/issue/tmp/issue.soft/tmp/issue.hard 1573051/etc/is Sue  1573051/tmp/issue.hard   

File processing of common Linux commands (ii)