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31 Cards in this Set
- Front
- Back
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Determine which unix system is being used
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uname
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Set an environment variable
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LINES=25
export LINES |
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Command to fide a program
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whereis
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5 environment variables
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HOME
PATH PWD TERM |
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Create / Delete Directory
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mkdir
rmdir -p makes parent directories |
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Display File Types
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file
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Where are file # stored
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per process file descriptor table
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Where is user/group information
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/etc/group
/etc/passwd |
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Change file permissions:
owner everything group read everyone nothing |
chmod u=rwx,g=r,o=
chmod u+rwx chmod 740 |
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list options
directories long all |
ls -
d l a |
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display the contents of a file
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cat
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display the contents of a file with line numbers
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cat -n
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copy command
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cp
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move command
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mv
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delete command
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rm
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copy, move, delete options
preserve permissions, timestamps recursive force overwrite of files prompt overwrite |
p
r f i |
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Print a document
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lpr #5 -P PRINTERNAME file
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Get the number of bytes in a file
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wc -c file
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zip file
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gzip file
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list a gzip file
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gzip -l file
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unzip file
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gunzip file.gz
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find some file whose size > 1000 bytes
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find / -size +1000c
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does a hard link share an inode
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yes
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disadvantages of hard link
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can not span devices
only allowed by superusers files deleted and replaced are lost |
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Command to create a hard link
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ln file file.hard
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Command to create a soft link
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ln -s file file.soft
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5 ways to share files
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copy them
common login share a users directory (permissions) common group Links |
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list processes
- hide leaders - for a user |
ps
-a -u 147 |
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5 TCP/IP Layers
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Device
Link Network Transport Application |
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return the name of the host
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hostname
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display who is logged into a server
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rwho servername
rusers servername |
