Commands by shadycraig (5)

  • revert a committed change in SVN

    This command can be used to revert a particular changeset in the local copy. I find this useful because I frequently import files into the wrong directory. After the import it says "Committed revision 123" or similar. to revert this change in the working copy do: svn merge -c -123 . (don't forget the .) and then commit. Show Sample Output


    1
    svn merge -c -REV
    shadycraig · 2010-06-21 15:11:13 2
  • Show directory sizes, refreshing every 2s

    This command shows the size of directories below here, refreshing every 2s. It will also track directories created after running the command (that what the find bit does). Show Sample Output


    0
    watch 'find -maxdepth 1 -mindepth 1 -type d |xargs du -csh'
    shadycraig · 2010-05-19 13:13:57 5
  • Count and show duplicate file names

    Useful for C projects where header file names must be unique (e.g. when using autoconf/automake), or when diagnosing if the wrong header file is being used (due to dupe file names) Show Sample Output


    0
    find . -type f |sed "s#.*/##g" |sort |uniq -c -d
    shadycraig · 2010-02-17 11:59:54 4
  • Configuring proxy client on terminal without leaving password on screen or in bash_history

    Prompts the user for username and password, that are then exported to http_proxy for use by wget, yum etc Default user, webproxy and port are used. Using this script prevent the cleartext user and pass being in your bash_history and on-screen Show Sample Output


    1
    set-proxy () { P=webproxy:1234; DU="fred"; read -p "username[$DU]:" USER; printf "%b"; UN=${USER:-$DU}; read -s -p "password:" PASS; printf "%b" "\n"; export http_proxy="http://${UN}:${PASS}@$P/"; export ftp_proxy="http://${UN}:${PASS}@$P/"; }
    shadycraig · 2010-02-04 13:12:59 4
  • A function to find the newest file in a directory

    Works recusivley in the specified dir or '.' if none given. Repeatedly calls 'find' to find a newer file, when no newer files exist you have the newest. In this case 'newest' means most recently modified. To find the most recently created change -newer to -cnewer. Show Sample Output


    1
    newest () { DIR=${1:-'.'}; CANDIDATE=`find $DIR -type f|head -n1`; while [[ ! -z $CANDIDATE ]]; do BEST=$CANDIDATE; CANDIDATE=`find $DIR -newer "$BEST" -type f|head -n1`; done; echo "$BEST"; }
    shadycraig · 2010-02-04 12:40:44 4

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calculate how much bogomips one cpu core has (assuming you have 4 cores).
on some distro's you have to replace "BogoMIPS" with "bogomips".

Recursively move folders/files and preserve their permissions and ownership perfectly

Throttle download speed (at speed x )
Axel --max-speed=x, -s x You can specify a speed (bytes per second) here and Axel will try to keep the average speed around this speed. Useful if you don?t want the program to suck up all of your bandwidth.

small CPU benchmark with PI, bc and time.
$ # 4 cores with 2500 pi digits $ CPUBENCH 4 2500 $. $ every core will use 100% cpu and you can see how fast they calculate it. $ if you do 50000 digitits and more it can take hours or days

find out how many days since given date
Exactly the same number of characters, exactly the same results, but with bc

command! -nargs=1 Vs vs <args>
Because entering ':' requires that you press shift, sometimes common command-line / mini-buffer commands will be capitalized by accident.

Replace multiple file extensions with a single extension
The above is just a prove of concept based around the nested bash substitution. This could be useful in situations where you're in a directory with many filetypes but you only want to convert a few. $ for f in *.bmp *.jpg *.tga; do convert $f ${f%.*}.png; done or you can use ls | egrep to get more specific... but be warned, files with spaces will cause a ruckus with expansion but the bash for loop uses a space delimited list. $ for f in $(ls | egrep "bmp$|jpg$|tga$"); do convert $f ${f%.*}.png; done I'm guessing some people will still prefer doing it the sed way but I thought the concept of this one was pretty neat. It will help me remember bash substitutions a little better :-P

history autocompletion with arrow keys
This will enable the possibility to navigate in the history of the command you type with the arrow keys, example "na" and the arrow will give all command starting by na in the history.You can add these lines to your .bashrc (without &&) to use that in your default terminal.

Deal with dot files safely

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

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