Midterm Commands Flashcards
ls
List contents of a directory
ls -al
List all contents of a directory, long style
ls -alR
List all directory contents recursively
pwd
Lists the present working directory
cd
changes directory
mkdir
makes a directory
date
lists current date, time, and timezone
echo $PATH
Prints to screen the path environment variable
su
substitute user, super user, or switch user
cat
displays a file on screen
source
Evaluates a file or resource as a TCL script
PATH
settings to change the environment variable PATH
PS1
used in scripts to change a multitude of settings
script
collection of commands stored in a file
cp
copy
ps
displays processes
top
displays processes in real time
file
determines file type
kill
kills a process
df
reports how much free disk space is available for each mount you have
grep
searches a file for your search term
free
displays memory usage
ifconfig
displays network information
cal
calendar for the year you specify
history
lists all the commands you have used
ps | awk ‘{print $4}’
pipes the process command into awk then prints the 4th column of the results
set
read and write variables
chmod
change access permissions of a file
cat /proc/meminfo
displays memory usage in detail
which
displays which executable is being run for your command
touch
creates a file
ln
creates a symbolic link (-s) or a hard link
rm
removes file or directory
dd
converts and copies a file, disk copy
od
dumps files in octal and other formats
more
displays more of a file
man
manual pages
whoami
displays current user
dd if=/dev/zero of=/tmp/mynull count=1
dd command. copies the contents of device “zero” out to the file “mynull” in the /tmp directory.
find
search for files in a directory hierarchy
wc
print the number of bytes, words, and lines in files
xargs
build and execute command lines from standard input
