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CMPSC 60: Week 5 Discussion

CMPSC 60: Week 5 Discussion. Topics for Today. Some Unix commands Unix shells. Find. Recursively search for files find . -name “*.txt” – list all files ending with “.txt” under the current dir find ~ -name ‘*.txt’ -maxdepth 2

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CMPSC 60: Week 5 Discussion

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  1. CMPSC 60: Week 5 Discussion

  2. Topics for Today • Some Unix commands • Unix shells

  3. Find • Recursively search for files • find . -name “*.txt” –list all files ending with “.txt” under the current dir • find ~ -name ‘*.txt’ -maxdepth 2 • Find files ending with .txt within home dir up to 2 levels deep • find / -type d -user cshiflet • find all directories on the server owned by cshiflet • find ~ -mtime -7 • find files under your home modified in the last 7 days (week)

  4. Find (cont.) • find ~ -size 0 -exec rm {} \; • Delete all zero length files under your home dir • find ~ -perm -006 -exec chmod o-rw {} \; • change all files under your home dir that can be read and written by all users so that they cannot

  5. Grep • search multiple files for a pattern • grep text * • print the lines of any files that have “text” in them • grep -r sometext * • same as before, searching recursively • grep -l sometext * • print only the filenames of files with “sometext”

  6. More Grep • grep -n ‘//’ *.cpp • print the lines from all .cpp files that have a ‘//’ in them, and print the line number it was found on • grep -v text file • print all the lines of file that do not have “text” in them • grep -i text * • print the lines of all files with “text” in them, insensitive to case

  7. Tar – Tape ARchive • Copy files to or from an archive • -x to extract • -t to test (list contents) • -c to create • -v to be verbose, print out what it’s doing • -f filename -- specifies input/output archive • -z -- gzip/gunzip the archive • -j -- bzip2/bunzip2 the archive

  8. Tar examples • tar -tzvf some.tar.gz • List the files in some.tar.gz • tar -xzf some.tar.gz • Extract the files in some.tar.gz to the current dir • tar -czf out.tar.gz indir/ • Compress the dir “indir” and all files in it into out.tar.gz

  9. Unix Shells • Program that launches at login and allows you to enter commands • Examples: • CSH / TCSH • BASH • SH • ZSH… and more

  10. CSH - Manipulating Variables • env - List all environment variables • set - Set a normal variable • set class = cs60 • setenv - Set an environment variable for the life of the shell (i.e. until you logout) • setenv PATH ${PATH}:/my/path/dir

  11. CSH - Important Env Variables • PATH - Directories to search when executing a program • HOME - Full path of your home directory • SHELL - Full path/name of your shell • HOSTNAME - Host the shell is running on • USER - User who invoked the shell (YOU)

  12. CSH - Important Normal Variables • prompt - Defines the prompt displayed • set prompt=“%M:%~%” • New prompt: host:~/current% • set prompt=“[%t] %M:%~%” • New prompt: [6:35pm] host:~/current% • Other prompt variables can be found by in the tcsh man page • history - Number of history commands stored • set history=100

  13. More prompt fun • %M – the machine you’re logged into • %~ – your current directory • %t – the current time • %n – your user name • %h – the current history event number set prompt = "\n%n@%M [%t] %~\n%h %

  14. CSH - Configuration Files • ~/.cshrc - Run whenever CSH is started • ~/.login - Run when you login with CSH • ~/.logout - Run when you logout

  15. CSH - ~/.cshrc • Used to setup initial: • PATH • prompt • aliases • User defined variables • Anything else you want every time you start CSH

  16. CSH - ~/.login • Put commands here that you only want execute when you first login

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