man command
| Path | Explanation |
|---|---|
alpha | a file in your current directory |
beta/gamma | a file in the beta directory, which is in your current directory |
/delta/epsilon | a file in the delta directory, which is inside the root directory. |
. | the current directory |
.. | the parent directory, one level up |
/ | the root directory |
~ | your home directory (only known to the shell, not in a program) |
~zeta | User zeta’s home directory (only known to the shell, not in a program) |
$ cd ~/tmp $ pwd /s/bach/a/class/ct320/tmp $ ls backup-2019 final.csv IQ04.csv IQ07.csv IQ11.csv IQ15.csv TLD-save ch IQ01.csv IQ04-old.csv IQ08.csv IQ12.csv Music.ico vars enrolled IQ02.csv IQ05.csv IQ09.csv IQ13.csv r7 z FINAL IQ03.csv IQ06.csv IQ10.csv IQ14.csv st $ ls ~/bin checkin curve imv p scores wikidiff checkin-checker demo-script l peek stats wikiedit checkin-file-checker domoss ll playpen tools wikigrep checkin_prog e lsf pwget u wikiupdate chit grade moss ruler unold wikiwhence cls grade-busy new run untar code grade-file-checker note runner vman cronedit grades old save wikicat $ mkdir zulu $ cd zulu $ pwd /s/bach/a/class/ct320/tmp/zulu $ cd $ pwd /s/bach/a/class/ct320 $ rmdir tmp/zulu
cd path — change current directory
ls path — list current (specified) directory
pwd — show current directory
mkdir path — create a new directory
rmdir path — remove a (empty) directory
cat, less, more file — display file contents
vi, gedit file — edit file contents
cp path path — copy file or directory
mv path path — move (rename) file or directory
rm path — remove file or directory
diff path path — compare file or directory
$ date >now $ ls -l now -rw------- 1 ct320 class 29 Dec 23 07:39 now $ chmod -w now $ ls -l now -r-------- 1 ct320 class 29 Dec 23 07:39 now $ echo "hi" >now /tmp/pmwiki-bash-scriptJ1dnoO: line 18: now: Permission denied
chmod permissions path — change permissions
chown owner path — change (user) ownership
chgrp group path — change (group) ownership
ps — display running processes
kill — terminate running processes
bg, fg, nice — process control commands
shutdown time — system shutdown
reboot — system reboot
date — system date and time
time command — measures command timing
whereis command — find command instances
dmesg — system boot messages
> to create/overwrite with stdout, >> to append, < for stdin
$ echo "hello" >foo $ echo "Zeta Eta Theta" >foo $ date >>foo $ cat foo Zeta Eta Theta Mon Dec 23 07:39:31 MST 2024
$ echo "hello" >foo $ echo "Zeta Eta Theta" >foo $ date >>foo $ cat foo Zeta Eta Theta Mon Dec 23 07:39:31 MST 2024 $ cat foo | sort Mon Dec 23 07:39:31 MST 2024 Zeta Eta Theta $ sort <foo Mon Dec 23 07:39:31 MST 2024 Zeta Eta Theta $ sort foo Mon Dec 23 07:39:31 MST 2024 Zeta Eta Theta
ls | less
find . -name temp.dat | grep -v zulu
set -o vi or set -o emacs
history — shows previous commands
sort — sort input line to output lines
-b : ignore white space
-f : case insenstive sorting
-n : compare fields as numbers
-r : reverse sort order
-k : specify sorting column
uniq — print unique lines (cull duplicates)
tee — copy input to two places
head, tail — print beginning or head of file
grep "regular-expression" — search for text
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Modified: 2017-08-20T15:30 User: Guest Check: HTML CSSEdit History Source |
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