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Lecture 2Unix Basics
Corpus LinguisticsFall 2004
© Kevin Cohen
Last time
• ssh –l my_name babel.colorado.edu
(connect with babel)• pwd (where am I?)• ls (what’s here?)• cd (I want to go somewhere else)• mkdir
Switches: Unix adverbs
• options that you specify• ls –l: long listings• ls –a: show hidden files, too• ls –t: sort by time• ls –lat: show all files, in long
format, sorted by time
Switches
Arguments: objects
• No argument allowed:– pwd
• Argument required:– mkdir
[kev@compbio kev]$ mkdirmkdir: too few argumentsTry `mkdir --help' for more information.[kev@compbio kev]$
Arguments
• Argument(s) optional:– cd (no arg—what happens?)– cd .. (arg is ..—what happens?)
Arguments
• Argument(s) optional:– cd (no arg—what happens?)– cd .. (arg is ..—what happens?)– ls (no arg—what happens?)– ls .cshrc (arg is .cshrc)
Arguments
• Argument(s) optional:– cd (no arg—what happens?)– cd .. (arg is ..—what happens?)– ls (no arg—what happens?)– ls .cshrc (arg is .cshrc)babel>ls .cshrc
.cshrc
babel>ls i_like_my_dog
i_like_my_dog not found
File named .cshrc exists
File named i_like_my_dog doesn’t exist
Wildcards
• Underspecified objects• Syntax: combine with any amount
of the name of an argument• Examples:• ls ling*• ls linguistics*• ls *linguistics
Wildcards
• Underspecified objects• Syntax: combine with any amount
of the name of an argument• Examples:• ls ling*• ls linguistics*• ls *linguistics
Semantics: “allow zero or more of any character(s) here”
Show me:
ling
linguist
linguistics
babel>pwd /home/kev/demo_wildcardsbabel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls ling
ling
babel>ls ling*
ling
linguistic_anthropology
linguistic_phonetics
linguistics
linguistics_and_the_law
linguists
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls linguist*
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls linguist*
linguistic_anthropology
linguistic_phonetics
linguistics
linguistics_and_the_law
linguists
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls *linguistics
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls *linguistics
linguistics
psycholinguistics
sociolinguistics
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls *ics
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls *ics
linguistic_phonetics
linguistics
phonetics
psycholinguistics
sociolinguistics
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls *and*
babel>lslinglinguistic_anthropologylinguistic_phoneticslinguisticslinguistics_and_the_lawlinguistsmorphologyphoneticspsycholinguisticssociolinguistics
babel>ls *and*
linguistics_and_the_law
Switches + Arguments
• You can combine them. – Switches come first.
• ls –lt li*• “List everything that starts with li
followed by zero or more of any other character…
• …show me the “long” version…• …and arrange them by “time.”
Two ways of specifying location
• Relative: walk out the door. Take stairs to first floor. Exit building from east. Take 36 to I-70. Get off at Vasquez exit. Merge onto Colorado. Turn left onto 23rd. Turn right onto Krameria. Go to next block. Go to house on southwest corner.
Two ways of specifying location
• Relative: walk out the door. Take stairs to first floor. Exit building from east. Take 36 to I-70. Get off at Vasquez exit. Merge onto Colorado. Turn left onto 23rd. Turn right onto Krameria. Go to next block. Go to house on southwest corner.
• Absolute: Go to 2089 Krameria St., Denver, CO.
I’m in /home/kev, and I want to see the contents of /home• Using relative
path:
ls ..
• Using absolute path:
ls /home
I’m in /home/kev, and I want to see the contents of
/home/jurafsky• Using relative
path:
ls ../jurafsky
• Using absolute path:
ls /home/jurafsky
/
bin home etc usr
otherfolks
jurafskykev
More things you can do with files
• View their contents• Copy• Rename/move them • Delete them• Count contents• Compare their contents
Please open a terminal and ssh to
babel
Viewing file contents
• The whole thing at once• The whole thing, a bit at a time• Just part of it
Viewing file contents
• The whole thing at once• cat filename• Example:• cd• ls -a• cat .cshrc
Viewing file contents
• The whole thing, a bit at a time• more filename• Example:• ls /corpora/celex/english• more /corpora/celex/english/README
Viewing file contents
• Just some of it (just the beginning)• head filename• head –number_of_lines filename• Example:• head /corpora/celex/english/README• head –20 /corpora/celex/english/README
Viewing file contents
• Just some of it (just the end)• tail filename• tail –number_of_lines filename• Example:• head /corpora/celex/english/README• head –20 /corpora/celex/english/README
Copying: cp
• A ditransitive verb• cp original_file new_file• Example:• cd• cp .cshrc .cshrc_bak
Caution: no guardrails
• touch junk• cat junk• cp .cshrc junk • cat junk
Moving/renaming: mv
• A ditransitive verb• mv original_file new_file• Example 1:• cd• ls• mv .cshrc.bak .cshrc_bak01
Moving/renaming: mv
• A ditransitive verb• mv original_file new_file• Example 1:• cd• ls• mv .cshrc.bak .cshrc_bak01
Renames the file
Moving/renaming: mv
• A ditransitive verb• mv original_file new_file• Example 2:• cd ling5200• ls• mv ../junk .
Moving/renaming: mv
• A ditransitive verb• mv original_file new_file• Example 2:• cd ling5200• ls• mv ../junk .
Moves the file from parent
to current directory
Moving/renaming: mv
• A ditransitive verb• mv original_file new_file• Example 3:• cd ling5200• ls• mv ../junk mango
Moving/renaming: mv
• A ditransitive verb• mv original_file new_file• Example 3:• cd ling5200• ls• mv ../junk mango
Moves from parent to current directory
and changes name
man pages
• Unix’s help facility• Syntax: man command_name• E.g.: man cp
To see more, hit the spacebar
Comparing files: diff
• A ditransitive verb• diff one_file another_file• Example 3:• cd ling5200• diff ../junk mango• touch junk• diff junk mango
man pages
• Name• Synopsis of syntax• Description• Options
man pages
Remember you said you’d like cp to ask you before it blew
away your file?
• Consult the man page for cp• Make a back-up copy of your .cshrc file
(cp .cshrc .cshrc.bk01)• Open it in a text editor (emacs .cshrc)• Create an alias for cp• Ctrl-XS Ctrl-X Ctrl-C• Tell Unix about your new alias
(source .cshrc)
Interlude
HW1
1. Well?
HW1 #1
“He has all of the primary facts that he needs, in the form of a corpus of approximately one zillion running words, and he sees his job as that of deriving secondary facts from his primary facts. At the moment he is busy determining the relative frequencies of the eleven parts of speech as the first word of a sentence versus the second word of a sentence.”
--Fillmore
HW1 #1
He sits in a deep soft armchair, with his eyes closed and his hands clasped behind his head. Once in a while he opens his eyes, sits up abruptly shouting, ‘Wow, what a neat fact!’, grabs his pencil, and writes something down…having come still no closer to knowing what language is really like.”
--Fillmore
HW1 #1
• Why should I think anything you tell me is true?
• Why should I think anything you tell me is interesting?
HW1 #1
“They [take] this to be science, very genuinely and very sadly.”
--Postal
HW1 #1
• Rationalism as theory, yes—method, no (Sampson)
• “I don’t think there can be any corpora, however large, that contain information about all of the areas of English lexicon and grammar that I want to explore…[but] every corpus I have had the chance to examine, however small, has taught me facts I couldn’t imagine finding out any other way.” (Fillmore)
HW1
5. ssh
Some important Unix concepts
• Redirection• Security/permissions• Environment
Piping and redirection
• Piping: sending the output of one command to another command as its input
cat .cshrc | wc
Use the output of
that…
…as the input for this
Piping and redirection
• ls –l /corpora2• ls –l /corpora2 | head• ls –l /corpora2 | head -5
Piping and redirection
• Redirection: sending output someplace other than to your screen
ls –l /corpora2 > corpora2_contents
Put the output of
this command
…
…into this file
Piping and redirection
• If the file doesn’t already exist…• If the file does already exist…• >>• cat .cshrc > junk• ls –lt /corpora2 >> junk
No space!
LINGUIST-L
Position Description:
Primary responsibility is the creation and maintenance of linguistic test data. This involves analyzing a set of sentences and generating the expected linguistic analysis based on the specification. Other responsibilities include evaluating linguistic coverage, reporting accuracy, generating linguistic bugs, and tracking regression of the products and technology.
Security
• passwd: change your password– no real words– mix case (E.g. M!nkeY, not m!nkey)– mix letters, other symbols (@rm3n!an)– change frequently– nothing obvious (chomsky, phonology,
birthday, cat’s name)– DON’T email them
Security
You
Security
You
...Z
Y
X
Security
students
...
staff
Permissions
File Directory
r •view•copy
list contents
w •change•delete
•create•delete
x execute cd into
Security
• Permissions
“-” means file
“d” means directory
you
(user)
Security
• Permissions
“-” means file
“d” means directory
Security
• Permissions
“-” means file
“d” means directory
you
(user)
group
Security
• Permissions
“-” means file
“d” means directory
you
(user)
group
others (world)
Changing permissions
• Easy way: chmod who+/-what filename
• Who:– u: user (you)– g: group– o: other (world)
Changing permissions
• Easy way: chmod who+/-what filename• Who:
– u: user (you)– g: group– o: other (world)
• What:– r: read– w: write– x: execute
Changing permissions
• Easy way: chmod who+/-what filename• Who:
– u: user (you)– g: group– o: other (world)
• What:– r: read– w: write– x: execute
chmod u+x helloWorld.pl
Changing permissions
• Easy way: chmod who+/-what filename• Who:
– u: user (you)– g: group– o: other (world)
• What:– r: read– w: write– x: execute
chmod u+x helloWorld.pl
chmod go-w helloWorld.pl
Changing permissions
• Medium: chmod u=rwx,g=r,o=r hello.pl• Who:
– u: user (you)– g: group– o: other (world)
• What:– r: read– w: write– x: execute
chmod u+x helloWorld.pl
chmod go-w helloWorld.pl
Changing permissions
• Hard: chmod 744 helloWorld.pl• Who:
– First digit: user (you)– Second digit: group– Third digit: other (world)
• What:– 4: read– 2: write– 1: execute– 0: nothing
chmod u+x helloWorld.pl
chmod go-w helloWorld.pl
Environment
• uname• echo $SHELL• echo $PATH• setenv• setenv DUMMY_VARIABLE melgibsonsux• echo $DUMMY_VARIABLE