Author: dblevins
Date: Fri Jul 22 21:49:15 2011
New Revision: 1149745
URL: http://svn.apache.org/viewvc?rev=1149745&view=rev
Log:
some productivity tips
Added:
openejb/site/trunk/content/mastering-the-command-line.mdtext
Added: openejb/site/trunk/content/mastering-the-command-line.mdtext
URL:
http://svn.apache.org/viewvc/openejb/site/trunk/content/mastering-the-command-line.mdtext?rev=1149745&view=auto
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--- openejb/site/trunk/content/mastering-the-command-line.mdtext (added)
+++ openejb/site/trunk/content/mastering-the-command-line.mdtext Fri Jul 22
21:49:15 2011
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+# Linux/OSX awesomeness
+
+Not specific to this projec, but can be incredibly useful ways to maximizes
your time. Mastering the command line is the best way to get things done,
quick and cheaply.
+
+Reapeat after me:
+
+ - I will write a script for any tasks I do regularly
+
+# Core commands
+
+Some very big time-saving commands
+
+## In shell scripts
+
+ - **basename** - what is the file name again? not the path, just the file name
+ - **dirname** - what directory is this in?
+ - **readllink -f** - what is the absolute path of this file?
+ - **cat** - spit out the contents of one or more files
+ - **cp** - copy file or dir
+ - **scp** - copy file or dir to another machine
+ - **rsync** - both the above, but so much more awesome
+ - rsync -av here there
+ - rsync -e ssh -av here user@host:there
+ - **cut** - wish I could i could chop out this column in the middle here
+ - **date** - would be nice if I had some way to make this log file name a
little more unique
+ - **echo** - System.out.println()
+ - **xargs** - can be useful but doesn't respect paths with spaces. I only use
it sometimes
+ - **find** - find some files and potentially execute a command against them
+ - **egrep** - search for text in a file or from STDIN. better than grep
+ - **mkdir** - makes a dir, with -p will make parent dirs too
+ - **mv** - move a file
+ - **head** - spit out the first N lines of a file
+ - **tail** - spit out the last N lines of a file
+ - **tee** - I want to see the output of this command, but I also want to
write it to a file. Oh! tee is awesome!
+ - **perl** - edit a stream: cat file.txt
+ - edit a file: perl -i -pe 's/this/that/'
+ - **pwd** - where am I?
+ - **rm** - delete
+ - **read (bash)** - I dig this out for strings with spaces. paths have spaces
in them sometimes
+ - ls *.txt
+ - find . -name "*.txt"
+ - **export (bash)** - why can't my script find this command? i use this to
debug scripts 'export > /tmp/script-env.txt'
+ - **for (bash)** - my favorite bash construct
+ - for n in one two three; do echo "$n"; done
+ - (side note, always quote your variables like "$n" vs $n, trust me it's a
good habit)
+ - **while (bash)** - my second favorite bash construct
+ - loop forever and do something: while true; do my_command; sleep 10; done
+ - **sleep** - Thread.sleep(). Only accepts seconds. I typically do the math
with bash sytax
+ - sleep for an hour: sleep $(( 60 * 60 ))
+ - sleep for a day: sleep $(( 60 * 60 * 24 ))
+ - **sort** - sort lines of text
+ - **uniq** - trim out the duplicates
+ - show me only things that had duplicates: uniq -d
+ - ( I always 'sort
+ - **ssh** - awesomeness. can execute commands remotely too
+ - ssh people.apache.org pwd
+ - ssh people.apache.org 'pwd
+ - **sudo** - I wish I were a fish. I wish I were a fish.
+ - **tar** - package up some stuff
+ - **wget** - download this url
+ - wget http://apache.org
+ - wget -q -O - http://apache.org
+ - **tr** - echo $PATH
+ - **uname** - what system am I on?
+
+## OSX commands
+
+ - **pbpaste** - paste the contents of the clipboard to stdout
+ - **pbcopy** - copy stdin to the clipbboard
+
+## running shell scripts
+
+ - **bash** - quick way to run a script if it isn't already executable
+ - **chmod** - this file should be executable
+ - **clear** - my terminal is messy
+ - **diff/patch** - comparing or merging file contents
+ - **ps/kill** - my script is running too long, i want to force it to stop
+ - **less** - paging through command line output
+ - **nohup** - I don't want this script to die if my connection is interrupted
+ - **which** - where does this command live?
+ - **crontab** - schedule something to run regularly (i use 'bash -l foo.sh'
to run stuff in my crontab file)
+ - **shutdown** - shutdown or restart a machine
+ - **top** - what the heck is chewing up my cpu?
+ - **uname** - what system am I on?
+
+# I never use
+
+Some people like it.
+sed -- i always use "perl -pe 's/find/replace/'")
+
+Getting used to using perl is better. This page was originally written
thinking markdown had table support
+like confluence does. Soo all lines where using "| command | description |"
formatting. Markdown doesn't
+have that, so I changed it to a list syntax with the following command on my
mac:
+
+`pbpaste | perl -ne '@f = split(" *\\| *", $_); print " - **$f[1]** -
$f[2]\n"' | pbcopy`
+
+
