Posts Tagged ‘unix命令’

FreeBSD skills everyday — 12

November 18, 2007 by ycg · 1 Comment
Filed under: Unix/Linux 
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Want to use sed(1) to edit a file in place?  Well, to replace every ‘e’ with
an ‘o’, in a file named ‘foo’, you can do:
        sed -i.bak s/e/o/g foo
And you’ll get a backup of the original in a file named ‘foo.bak’, but if you
want no backup:
        sed -i ” s/e/o/g foo

FreeBSD skills everyday — 11

November 17, 2007 by ycg · Leave a Comment
Filed under: Unix/Linux 
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You can use aliases to decrease the amount of typing you need to do to get
commands you commonly use.  Examples of fairly popular aliases include (in
Bourne shell style, as in /bin/sh, bash, ksh, and zsh):
        alias lf="ls -FA"
        alias ll="ls -lA"
        alias su="su -m"
In csh or tcsh, these would be
        alias lf ls -FA
        alias [...]

FreeBSD skills everyday — 10

November 16, 2007 by ycg · Leave a Comment
Filed under: Unix/Linux 
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If you are running xterm, the default TERM variable will be ‘xterm’.  If you
set this environment variable to ‘xterm-color’ instead, a lot of programs will
use colors.  You can do this by
        TERM=xterm-color; export TERM
in Bourne-derived shells, and
        setenv TERM xterm-color
in csh-derived shells.

FreeBSD skills everyday — 9

November 15, 2007 by ycg · Leave a Comment
Filed under: Unix/Linux 
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To find out the hostname associated with an IP address, use
        dig -x IP_address
                — Dru <genesis@istar.ca>

FreeBSD skills everyday — 8

November 14, 2007 by ycg · Leave a Comment
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Need to see the calendar for this month? Simply type "cal".  To see the
whole year, type "cal -y".
                — Dru <genesis@istar.ca>

FreeBSD skills everyday — 7

November 12, 2007 by ycg · Leave a Comment
Filed under: Unix/Linux 
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To change an environment variable in /bin/sh use:
        $ VARIABLE="value"
        $ export VARIABLE

FreeBSD skills everyday — 6

November 11, 2007 by ycg · Leave a Comment
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To search for files that match a particular name, use find(1); for example
        find / -name "*GENERIC*" -ls
will search ‘/’, and all subdirectories, for files with ‘GENERIC’ in the name.
        –  Stephen Hilton <nospam@hiltonbsd.com>

FreeBSD skills everyday — 5

November 10, 2007 by ycg · Leave a Comment
Filed under: Unix/Linux 
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If you want df(1) and other commands to display disk sizes in
kilobytes instead of 512-byte blocks, set BLOCKSIZE in your
environment to ‘K’.  You can also use ‘M’ for Megabytes or ‘G’ for
Gigabytes.  If you want df(1) to automatically select the best size
then use ‘df -h’.

FreeBSD skills everyday — 4

November 9, 2007 by ycg · Leave a Comment
Filed under: Unix/Linux 
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Want to know how many words, lines, or bytes are contained in a file? Type
"wc filename".
                — Dru <genesis@istar.ca>