whereis - answer-used to search for programs in restricted locations, such as binary file directories, libraries, and man directories.
locate - answer-Searches the system managed database of filenames for files containing the specified string in the filenames. (Search is much faster than the sea...
010-160: LPI LINUX ESSENTIALS
whereis - answer-used to search for programs in restricted locations, such as binary file
directories, libraries, and man directories.
locate - answer-Searches the system managed database of filenames for files containing the
specified string in the filenames. (Search is much faster than the search performed using the
'find' command)
updatedb - answer-Updates the system managed database of filenames
Displays current working directory - answer-pwd
Change into the current user's home directory - answer-cd ~
cd $HOME
Both of these do what
Change to the parent directory of the current directory - answer-cd ..
Change to the etc directory in the root (/) directory - answer-cd /etc
Creates a hard link named 'format.txt' for the file 'fmt.txt' - answer-ln fmt.txt format.txt
Creates a symbolic link named sym.txt of fmt.txt - answer-ln -s fmt.txt sym.txt
touch - answer-Can be used to update the timestamp of a file or if that file doesn't exist it will
create a blank file with the specified name.
Will update the timestamp of the specified file if it exists. If it does not exist it will not create a
blank file. - answer-touch -c file1.txt
Adds the content "Hey there!" to the specified file. - answer-echo "Hey there!" > sample.txt
cat filename.txt - answer-Displays the contents of a file
Opens the vi editor for the file "sample". This will allow you to write text into a file. - answer-vi
sample
Will display the "sample" file's byte count - answer-wc -c sample
Displays the number of characters in the "sample" file - answer-wc -m sample
Display the number of lines in the "sample" file - answer-wc -l sample
Display the word count of the "sample" file - answer-wc -w sample
Extracts the first field of the "/etc/passwd" file - answer-cut -f 1 /etc/passwd
, Extract the first three characters from the "/etc/passwd" file - answer-cut -c 1, 2, 3 /etc/passwd
Extracts the third field from the "/etc/shadow" file and uses the : seperator. Since "/etc/shadow"
is a : (colon) seperated file, this command will display only the content of the third field in the
file. - answer-cut -d ":" -f 3 /etc/shadow
Search for all the rows containing the string "/home" in the "/etc/passwd" file - answer-grep
/home /etc/passwd
Display the number of lines containing the string "/bin" in the "/etc/passwd" file - answer-grep -
c /bin /etc/passwd
Display the details of the root user from the /etc/shadow file - answer-grep root /etc/shadow
Search the /etc directory recursively for the string "wlan" - answer-grep -r wlan /etc
Find all the files in the /etc directory having names that start with pass - answer-find /etc -name
pass*
List the files in the /etc directory with extensions conf (limit the search to one level) - answer-find
/etc -maxdepth 1 -name *.conf
List all the files on system with the permission set 640 (limit the search to two levels) - answer-
find / -maxdepth 2 -perm 640
List the files in the var/cache directory owned by the root user (limit the search to two levels) -
answer-find /var/cache -maxdepth 2 -user root
find /var/cache -maxdepth 2 -uid 0
List all the files in the /root directory that belong to the root group (do not use shorthand for
specifying the directory) - answer-find /root -group root
find /root -gid 0
Sort the contents of the /etc/passwd file, and display it on the stdout - answer-sort /etc/passwd
Numeric sort the third field of the /etc/passwd file and display it on the stdout - answer-cut -f 3 -d
":" /etc/passwd | sort -n
Redirects the output of the echo $HOME command to a file named sample, overwriting its
contents - answer-echo $HOME > sample
Appends the output of the pwd command to the sample file - answer-pwd >> sample
Redirects the sample file as an input to the cat command. This will display the contents of the
sample file. - answer-cat < sample
Appends only the standard error of the pwd;ech command to the sample file. - answer-pwd;ech
2>> sample
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