Common linux commands for File Processing

Common linux commands for File Processing

Command name: touch

Path:/bin. touch

Execution permission: All Users

 

Oot @ localhost tmp] # touch list.txt [root @ localhost tmp] # touch/root/list.txt [root @ localhost tmp] # touch program files [root @ localhost tmp] # ll total 52drwxr-xr-x 2 root 4096 12-01 china-rw-r -- 1 root 0 12-01 filesdrwx ------ 3 root 4096 11-30 gconfd-root-rw ------- 1 root 630 12-01 grub. confdrwx ------ 2 root 4096 11-30 keyring-n4KWUI-rw-r -- r -- 1 root 0 12-01 list.txt srwxr-xr-x 1 root 0 11-30 mapping-rootdrwx ------ 2 root 4096 12-01 orbit-root-rw-r -- 1 root 0 12-01 program-rw-r -- 1 root 5 12- 01 scim-bridge-0.3.0.lockfile-0 00 @ localhost: 0.0srwxr-xr-x 1 root 0 11-30 20:10 scim-bridge-0.3.0.socket-0 @ localhost: 0.0srw ------- 1 root 0 11-30 :16 16 scim-helper-manager-socket-rootsrw ------- 1 root 0 11-30 :16 16 scim-panel-socket: 0-rootsrw ------- 1 root 0 11-30 scim-socket-frontend-rootdrwx ------ 2 root 4096 11-30 ssh-mibWGs4219drwx ------ 2 root 4096 11-30 virtual-root.tyft1adrwxr-xr-x 2 root 4096 11-30 vmware-config0drwxrwxrwt 4 root 4096 11-30 VMwareDnDdrwxr-xr-x 2 root 4096 11-30 vmware-rootdrwx ------ 2 root 4096 11-30 vmware-root-2083992326 [root @ localhost tmp] # touch "profile file" [root @ localhost tmp] # lschinafilesgconfd-rootgrub.confkeyring-n4KWUIlist.txtmapping-rootorbit-root profile fileprogramscim-bridge-0.3.0.lockfile-0 @ localhost: 0.0scim-bridge-0.3.0.socket-0 @ localhost: 0.0scim-helper-manager-socket-rootscim-panel-socket: Sources [root @ localhost tmp] #

 

Command name: cat

Command path:/bin/cat

Execution permission: All Users

 

[root@localhost tmp]# cat /etc/issueRed Hat Enterprise Linux Server release 5.4 (Tikanga)Kernel \r on an \m[root@localhost tmp]# cat -n /etc/issue     1  Red Hat Enterprise Linux Server release 5.4 (Tikanga)     2  Kernel \r on an \m     3[root@localhost tmp]# 

Command name: tac

 

Path:/usr/bin/tac

 

[Root @ localhost tmp] # cat/etc/issueRed Hat Enterprise Linux Server release 5.4 (Tikanga) kernel \ r on an \ m [root @ localhost tmp] # cat-n/etc/issue 1 Red Hat Enterprise Linux Server release 5.4 (Tikanga) 2 Kernel \ r on an \ m 3 [root @ localhost tmp] # [root @ localhost tmp] # tac/etc/issueKernel \ r on an \ mRed Hat Enterprise Linux Server release 5.4 (Tikanga) [root @ localhost tmp] # tac-n/etc/issuetac: Invalid Option -- N. Please execute "tac -- help" to obtain more information.

Command name: more can only go down

 

Path:/bin/more

Space f q

Command name: less

Page UP (to the previous page)

Collect

 

[root@localhost tmp]# less /etc/services 

Command name: head, tail

 

 

[root@localhost 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 is presently the policy of IANA to assign a single well-known# port number for both TCP and UDP; hence, most entries here have two entries# even if the protocol doesn't support UDP operations.# Updated from RFC 1700, ``Assigned Numbers'' (October 1994).  Not all ports# are included, only the more common ones.[root@localhost tmp]# head -1  /etc/services # /etc/services:[root@localhost tmp]# 

 

 

[Root @ localhost tmp] # tail-f/etc/services # dynamic changes 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 synchronously updated, but cannot boast of partitions, and cannot be used to create hard links for directories.

 

[Root @ localhost tmp] # ln-s/etc/issue/tmp/issue. soft [root @ localhost tmp] # ln/etc/issue/tmp/issue. hard [root @ localhost tmp] # ln-l/etc/issueln: Invalid option -- l Please execute "ln -- help" for more information. [Root @ localhost tmp] # ls-l/etc/issue-rw-r -- 2 root 74 2009-08-04/etc/issue [root @ localhost tmp] # ls-l /tmp/issue *-rw-r -- 2 root 74 2009-08-04/tmp/issue. hardlrwxrwxrwx 1 root 10 12-01 14:36/tmp/issue. soft->/etc/issue [root @ localhost tmp] # [root @ localhost tmp] # ls-I/etc/issue/tmp/issue. soft/tmp/issue. hard 1573051/etc/issue 1573051/tmp/issue. hard 917638/tmp/issue. soft [root @ localhost tmp] #