Posts Tagged ‘unix命令’

FreeBSD skills everyday — 12

November 18, 2007 by ycg · 1 Comment
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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 [...]

FreeBSD skills everyday — 11

November 17, 2007 by ycg · Leave a Comment
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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 [...]

FreeBSD skills everyday — 10

November 16, 2007 by ycg · Leave a Comment
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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
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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
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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
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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
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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>