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Commands by rdc

Commands by rdc from sorted by
Terminal - Commands by rdc - 7 results
find . -cnewer <file a> -and ! -cnewer <file b>
2012-08-15 21:57:42
User: rdc
Functions: find
Tags: find
1
Up
Down
Find files changed between dates defined by ctime of two files specified by name

This command finds all the files whose status has changed between the ctime of the older and newer .

Very useful if you can see from an ls listing a block of consecutive files you want to move or delete, but can't figure out exactly the time range by date.

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export HISTFILE="$HOME/.bash_history-$(hostname -s)"
2012-05-01 13:23:15
User: rdc
Functions: export
4
Up
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Ensure that each machine that you log in to has its own history file

On systems where your home directory is shared across different machines, your bash history will be global, rather than being a separate history per machine. This setting in your .bashrc file will ensure that each machine has its own history file.

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time dd if=/dev/zero of=dummy_file bs=512k count=200
2012-04-20 13:47:27
User: rdc
Functions: dd time
1
Up
Down
Test I/O performance by timing the writing of 100Mb to disk

Write 200 blocks of 512k to a dummy file with dd, timing the result. The is useful as a quick test to compare the performance of different file systems.

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ln -nsf <TARGET> <LINK>
2011-07-14 14:07:06
User: rdc
Functions: ln
Tags: Linux symlinks
20
Up
Down
Repoint an existing symlink to a new location

Instead of deleting an existing symlink and then re-creating it pointing at the new location, it is possible to perform the same action with this one command.

Interesting discussion on whether this is possible to do atomically here: http://answers.google.com/answers/threadview?id=526119

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http_proxy=<proxy.server:port> wget <url>
2011-03-30 13:06:19
User: rdc
Functions: wget
Tags: wget firewall proxy
0
Up
Down
Pass the proxy server address as a prefix to wget

On a machine behind a firewall, it's possible to pass the proxy server address in as a prefix to wget to avoid having to set it as an environment variable first.

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wget -e robots=off -E -H -k -K -p http://<page>
2011-01-07 10:38:24
User: rdc
Functions: wget
8
Up
Down
Use wget to download one page and all it's requisites for offline viewing
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tar -zxvf file.tar.gz -C /tmp
2010-11-17 14:26:14
User: rdc
Functions: tar
Tags: Linux tar unzip
0
Up
Down
Unzip and untar a *.tar.gz file in one go to a specific directory

A *.tar.gz file needs to be unzipped & then untarred. Previously I might have unzipped first with

gunzip -d file.tar.gz

and then untarred the result with

tar -xvf file.tar

(Options are extract, verbose, file)

Using the -z (decompress) option on tar avoids the use of gzip (or gunzip) first.

Additionally the -C option will specify the directory to extract to.

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