Change file extensions with bash shell
To change all .htm files in a folder to .html files:
for f in *.htm; do mv $f `basename $f .htm`.html; done;
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bash shell directory shortcuts
Go back to your previous directory:
Go to a new directory and push the current one onto a stack:
Pop a directory from the stack and go to it:
cd -
Go to a new directory and push the current one onto a stack:
pushd /newdirectory
Pop a directory from the stack and go to it:
popdResuming an aborted scp transfer
Assume you have copied a file across the network using something like this:
Then assume something goes wrong, so the transfer is interrupted. To continue the transfer, do this:
(Or, rather, always use rsync as above when transferring very large files.)
(Also note: I don't know how frequently rsync flushes its buffer, but don't assume something is wrong just because the file you're downloading doesn't increase in size in the file system. When you interrupt rsync using Ctrl-C, it will flush its buffers.)
scp host:/path/to/file .
Then assume something goes wrong, so the transfer is interrupted. To continue the transfer, do this:
rsync --partial host:/path/to/file .
(Or, rather, always use rsync as above when transferring very large files.)
(Also note: I don't know how frequently rsync flushes its buffer, but don't assume something is wrong just because the file you're downloading doesn't increase in size in the file system. When you interrupt rsync using Ctrl-C, it will flush its buffers.)
Doing something equivalent of "svn status" in CVS
The "cvs status" command is practically useless, given the amount of stuff it spews out. So I do the following to find out the status of my local working copy. This shows all updated, added, or deleted files, as well as those CVS know nothing about (and which perhaps should be added):
cvs status 2>&1 | egrep "(^\? |Status: )" | grep -v Up-to-date
iTunes arrows search local library
A neat trick in iTunes 4.5 that changes the little arrows next to each artist/album/title to search your library for that string instead of the iTunes Music Store.
defaults write com.apple.iTunes invertStoreLinks -bool YES
turn off disk image verification
defaults write com.apple.frameworks.diskimages skip-verify true
automatically authorize a remote host (SSH key swap)
use with caution! This script will copy your pub key to a remote host so you can login or run remote scripts without a password. IMPORTANT: if you need to run a single script on the remote host, it would be better to authorize a key for just that script.
#!/bin/bash # kumar.mcmillan -at- farmdev.com function usage() { echo "" echo "Authorizes a host for automatic SSH use by sending your key to the remote host ..." echo "Usage: $0 remote_host_to_authorize [username:=defaults to current username]" echo "" } function cleanup() { if [ -f $TEMP_PUB_KEY_XFER ] then rm $TEMP_PUB_KEY_XFER fi } function exit_on_error() { cleanup exit 1 } if [ $# -lt 1 -o "$1" = "-h" -o "$1" = "--help" ] then usage exit 0 fi PUB_KEY=~/.ssh/id_dsa.pub if [ $# -eq 2 ]; then USER=$2 else USER=`whoami` fi HOST_TO_AUTH=$1 TEMP_PUB_KEY_XFER=/tmp/$USER"_TEMP_KEY" echo "checking for $PUB_KEY ..." if [ ! -f $PUB_KEY ]; then echo "generating your dsa public key (leave passphrase blank and save to $PUB_KEY when prompted) ..." ssh-keygen -t dsa if [ $? -ne 0 ]; then echo "ssh-keygen failed" exit_on_error fi fi echo "OK" echo "for the following commands you will be asked to supply your password for $HOST_TO_AUTH :" echo "copying a temp pub key to $HOST_TO_AUTH ..." cat $PUB_KEY > $TEMP_PUB_KEY_XFER chmod 700 $TEMP_PUB_KEY_XFER echo "OK" remote_key=`basename $TEMP_PUB_KEY_XFER` scp $TEMP_PUB_KEY_XFER $USER@$HOST_TO_AUTH:~/$remote_key if [ $? -ne 0 ]; then echo "scp failed" exit_on_error fi echo "authorizing $HOST_TO_AUTH for automatic SSH use ..." ssh $USER@$HOST_TO_AUTH "cat ~/$remote_key >> ~/.ssh/authorized_keys; rm ~/$remote_key" if [ $? -ne 0 ]; then echo "ssh failed" exit_on_error fi echo "OK" cleanup echo "authorization successful! you can now login automatically to $HOST_TO_AUTH" exit 0
Browse pydoc locally ...
Opens pydoc in your browser. If pydoc has not been started it starts it for you.
#!/bin/bash PYDOC=`which pydoc` if [ ! -x ${PYDOC} ] then echo "could not find executable pydoc (tried: ${PYDOC})" exit 1 fi # passthru ... if [ $# -gt 0 ] then ${PYDOC} $@ exit $? fi #-------------------------------------- # or else... start it up automagically : PYDOC_PORT=9000 PYDOC_SERVER=http://localhost:${PYDOC_PORT}/ running=0 pydoc_pses=0 function browse_docs() { open ${PYDOC_SERVER} } for ps in `ps ax | grep "${PYDOC}" | awk '{ print $1 }'` do let pydoc_pses++ done if [ $pydoc_pses -ge 2 ] then browse_docs else ${PYDOC} -p ${PYDOC_PORT} & until `curl -o /dev/null ${PYDOC_SERVER} &>/dev/null` do echo "waiting for pydoc server ..." sleep 2 done browse_docs fi exit 0
Get a screenshot
screencapture -S /tmp/screengrab.pdf ; sips -s format png /tmp/screengrab.pdf --out /tmp/screengrab.png; open /tmp/screengrab.png
