ls -l --- lists your files in 'long format', which contains lots of useful information, e.g. the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified.
ls -a --- lists all files, including the ones whose filenames begin in a dot, which you do not always want to see.
ls -altr - a option is to show the hidden files
more filename --- shows the first part of a file, just as much as will fit on one screen. Just hit the space bar to see more or q to quit. You can use /pattern to search for a pattern.
emacs filename --- is an editor that lets you create and edit a file.
rm -f file name to delete files without interation
cp file1 file2 copies file1 to file2
chmod 777 filename ------- to give all permissions (read 4, Write 2, execute 1)
chmod 644 filename to give write permissions
diff filename1 filename2 --- compares files, and shows where they differ
wc filename --- tells you how many lines, words, and characters there are in a file
Directories:
mkdir dirname --- make a new directory
cd dirname --- change directory. You basically 'go' to another directory, and you will see the files in that directory when you do 'ls'. You always start out in your 'home directory', and you can get back there by typing 'cd' without arguments. 'cd ..' will get you one level up from your current position. You don't have to walk along step by step - you can make big leaps or avoid walking around by specifying pathnames
rm -r dirname to delete directory
pwd --- tells you where you currently are.
File Compression:
Making Archive file:
tar -cvf tarfilename(samlogserver).tar file1 file2.. to make tar file of files1,file2........
gzip filename --- compresses files, so that they take up much less space. Usually text files compress to about half their original size, but it depends very much on the size of the file and the nature of the contents. There are other tools for this purpose, too (e.g. compress), but gzip usually gives the highest compression rate. Gzip produces files with the ending '.gz' appended to the original filename.
gunzip filename --- uncompresses files compressed by gzip.
gzcat filename --- lets you look at a gzipped file without actually having to gunzip it (same as gunzip -c). You can even print it directly, using gzcat filename | lpr
gzcat tarfilename tar-xvf
gzip tarfilename ( Compresses the archived tar file)
gunzip gzfilename
jar -tvf jar file name --- it shows list of classes in the jar file
zip filename.zip filename - zipping a file and opening a file in windows
Printing:
lpr filename --- print. Use the -P option to specify the printer name if you want to use a printer other than your default printer. For example, if you want to print double-sided, use 'lpr -Pvalkyr-d', or if you're at CSLI, you may want to use 'lpr -Pcord115-d'. See 'help printers' for more information about printers and their locations.
lpq --- check out the printer queue, e.g. to get the number needed for removal, or to see how many other files will be printed before yours will come out
lprm jobnumber --- remove something from the printer queue. You can find the job number by using lpq. Theoretically you also have to specify a printer name, but this isn't necessary as long as you use your default printer in the department.
genscript --- converts plain text files into postscript for printing, and gives you some options for formatting. Consider making an alias like alias ecop 'genscript -2 -r \!* | lpr -h -Pvalkyr' to print two pages on one piece of paper.
dvips filename --- print .dvi files (i.e. files produced by LaTeX). You can use dviselect to print only selected pages. See the LaTeX page for more information about how to save paper when printing drafts.
Disk Size:
du -hs file name/directory ----------- to get the size of the file/directory
df -h ------ size of each mount
du -hs SUNWam -------- to get the size of SUNWam file/directory
Finding things
ff --- find files anywhere on the system. This can be extremely useful if you've forgotten in which directory you put a file, but do remember the name. In fact, if you use ff -p you don't even need the full name, just the beginning. This can also be useful for finding other things on the system, e.g. documentation.
grep string filename(s) --- looks for the string in the files. This can be useful a lot of purposes, e.g. finding the right file among many, figuring out which is the right version of something, and even doing serious corpus work. grep comes in several varieties (grep, egrep, and fgrep) and has a lot of very flexible options. Check out the man pages if this sounds good to you
find ./ -name 'direcorty or file name' ----------------- finds the given direcorty or file name.
find . -name *.log -exec grep -il oracle {} ;
find . name *.* -exec grep -il 'Enter new PIN, containing 4 to 8 characters' {};
find . | xargs grep "p-level Policy Admin Role,ou=role,dc=dupont,dc=com,amsdkdn=cn"
find . | xargs grep stg
:1,$s/^M//g ------- to remove ^M character from vi editor
:%s/^M//g --------------to remove ^M character from vi editor
Miscellanious:
lsof | grep slapd | grep LISTEN --------- to find portnumber of the various slapd instances
lsof | grep ldaprole | grep LISTEN -------- to find portnumber of various ldaprole instances
ps -ef | grep slapd ---- to find the DS Instances are running or not
export PATH=$PATH:/opt/sfw/bin -------------- to export the bin path
kill -9 PID
Kill PID
nohup Run the command in the background
& Run the command even if Putty gets logged out
gzip -dc "filename.tar.gz" | tar -xof - ( For
Roles:
id to get the current ID
sudo su - eisadmin to get eisadmin permissions
sudo stop/start
sudo -l to get the list of sudo permissions
sudo su - root ------ to get the root permissions
sudo su - ldaprole to get ldaprole permission
About other people:
w --- tells you who's logged in, and what they're doing. Especially useful: the 'idle' part. This allows you to see whether they're actually sitting there typing away at their keyboards right at the moment.
who --- tells you who's logged on, and where they're coming from. Useful if you're looking for someone who's actually physically in the same building as you, or in some other particular location.
finger username --- gives you lots of information about that user, e.g. when they last read their mail and whether they're logged in. Often people put other practical information, such as phone numbers and addresses, in a file called .plan. This information is also displayed by 'finger'.
last -1 username --- tells you when the user last logged on and off and from where. Without any options, last will give you a list of everyone's logins.
talk username --- lets you have a (typed) conversation with another user
write username --- lets you exchange one-line messages with another user
elm --- lets you send e-mail messages to people around the world (and, of course, read them). It's not the only mailer you can use, but the one we recommend. See the elm page, and find out about the departmental mailing lists (which you can also find in /user/linguistics/helpfile).
About your self
whoami --- returns your username. Sounds useless, but isn't. You may need to find out who it is who forgot to log out somewhere, and make sure *you* have logged out.
finger & .plan files
of course you can finger yourself, too. That can be useful e.g. as a quick check whether you got new mail. Try to create a useful .plan file soon. Look at other people's .plan files for ideas. The file needs to be readable for everyone in order to be visible through 'finger'. Do 'chmod a+r .plan' if necessary. You should realize that this information is accessible from anywhere in the world, not just to other people on turing.
passwd --- lets you change your password, which you should do regularly (at least once a year). See the LRB guide and/or look at help password.
ps -u yourusername --- lists your processes. Contains lots of information about them, including the process ID, which you need if you have to kill a process. Normally, when you have been kicked out of a dialin session or have otherwise managed to get yourself disconnected abruptly, this list will contain the processes you need to kill. Those may include the shell (tcsh or whatever you're using), and anything you were running, for example emacs or elm. Be careful not to kill your current shell - the one with the number closer to the one of the ps command you're currently running. But if it happens, don't panic. Just try again :) If you're using an X-display you may have to kill some X processes before you can start them again. These will show only when you use ps -efl, because they're root processes.
kill PID --- kills (ends) the processes with the ID you gave. This works only for your own processes, of course. Get the ID by using ps. If the process doesn't 'die' properly, use the option -9. But attempt without that option first, because it doesn't give the process a chance to finish possibly important business before dying. You may need to kill processes for example if your modem connection was interrupted and you didn't get logged out properly, which sometimes happens.
quota -v --- show what your disk quota is (i.e. how much space you have to store files), how much you're actually using, and in case you've exceeded your quota (which you'll be given an automatic warning about by the system) how much time you have left to sort them out (by deleting or gzipping some, or moving them to your own computer).
du filename --- shows the disk usage of the files and directories in filename (without argument the current directory is used). du -s gives only a total.
last yourusername --- lists your last logins. Can be a useful memory aid for when you were where, how long you've been working for, and keeping track of your phonebill if you're making a non-local phonecall for dialling in.
Connecting to the outside world
nn --- allows you to read news. It will first let you read the news local to turing, and then the remote news. If you want to read only the local or remote news, you can use nnl or nnr, respectively. To learn more about nn type nn, then \tty{:man}, then \tty{=.*}, then \tty{Z}, then hit the space bar to step through the manual. Or look at the man page. Or check out the hypertext nn FAQ - probably the easiest and most fun way to go.
rlogin hostname --- lets you connect to a remote host
telnet hostname --- also lets you connect to a remote host. Use rlogin whenever possible.
ftp hostname --- lets you download files from a remote host which is set up as an ftp-server. This is a common method for exchanging academic papers and drafts. If you need to make a paper of yours available in this way, you can (temporarily) put a copy in /user/ftp/pub/TMP. For more permanent solutions, ask Emma. The most important commands within ftp are get for getting files from the remote machine, and put for putting them there (mget and mput let you specify more than one file at once). Sounds straightforward, but be sure not to confuse the two, especially when your physical location doesn't correspond to the direction of the ftp connection you're making. ftp just overwrites files with the same filename. If you're transferring anything other than ASCII text, use binary mode.
lynx --- lets you browse the web from an ordinary terminal. Of course you can see only the text, not the pictures. You can type any URL as an argument to the G command. When you're doing this from any Stanford host you can leave out the .stanford.edu part of the URL when connecting to Stanford URLs. Type H at any time to learn more about lynx, and Q to exit
date --- shows the current date and time.
cal --- shows a calendar of the current month. Use e.g., 'cal 10 1995' to get that for October 95, or 'cal 1995' to get the whole year
VI Editor Commands:
Saving a file:
:w
:w newfile
:w! prevfile
Exit vi:
:x
:wq
:q
:q!
Moving the Cursor:
j or
k [or up-arrow] move cursor up one line
0 (zero) move cursor to start of current line (the one with the cursor)
$ move cursor to end of current line
:0
:$
Screen Manipulation:
^f move forward one screen
^b move backward one screen
Text Editor:
u UNDO WHATEVER YOU JUST DID; a simple toggle
i insert text before cursor, until
I insert text at beginning of current line, until
a append text after cursor, until
A append text to end of current line, until
o open and put text in a new line below current line, until
O open and put text in a new line above current line, until
r replace single character under cursor (no
x delete single character under cursor
dd delete entire current line
D delete the remainder of the line, starting with current cursor position
yy copy (yank, cut) the current line into the buffer
p put (paste) the line(s) in the buffer into the text after the current line
/string search forward for occurrence of string in text
?string search backward for occurrence of string in text
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