Lab Assignment $3-1$ Bash Shell Linux$+$ and LPIC$-1$

$1.$ Create an alias called $$MM$$ that displays only those filesystems that are mounted and are type ext$4$ filesystems.

alias mm$=$'mount $|$ grep ext$4\text{'}$

echo "alias mm$=$'mount $|$ grep ext$4\text{'}">>$ ~$/.$bashrc

source ~$/.$bashrc

$2.$ Create and export a variable called NEWHOME that is equivalent to the value contained in the HOME variable.

export NEWHOME$=$$HOME

echo "export NEWHOME$=\backslash$$HOME" $>>$ ~$/.$bashrc

source ~$/.$bashrc

$3.$ Find all files that start with the word $$host$$ starting from the $/$etc directory and save the Standard Output to a file called fileout and Standard Error to a file called fileerr.

find $/$etc $-$name "host$*">$ fileout $2>$ fileerr

cat fileout

cat fileerr

$4.$ Display only the lines from the output of the set command that the word $$bash$$ in them. This output should be sorted alphabetically.

set $|$ grep "bash" $|$ sort

set $|$ grep "bash" $|$ sort $>$ bash$\_$variables.txt

less bash$\_$variables.txt

$5.$ Display only the user name $($first field$)$ in the colon$-$delimited $/$etc$/$password file and save the output to a file called users.

cut $-$d: $-$f$1/$etc$/$passwd $>$ users

cat users

sudo cut $-$d: $-$f$1/$etc$/$passwd $>$ users

sudo cat users

$6.$ Redirect the output of the ls $$l ~ command to a file named mydirectory.

ls $-$l ~ $>$ mydirectory

cat mydirectory

sudo ls $-$l ~ $>$ mydirectory

sudo cat mydirectory

$7.$ Pipe the output of the ls $$al $/$ to the more utility

ls $-$al $/|$ more

sudo ls $-$al $/|$ more

$8.$ Assume you have two files: text$1$ and text$2,$ concatenate the output of text$2$ to text$1.$

cat text$2>>$ text$1$

cat text$2>$ text$1$

cat text$1$

sudo cat text$2>>$ text$1$

sudo cat text$1$

$9.$ Change the prompt on your computer to: $$This is a new prompt: $$$

export PS$1=$"This is a new prompt: $\backslash$$ $"$

echo 'export PS$1=$"This is a new prompt: $\backslash \backslash$$ $"\text{'}>>$ ~$/.$bashrc

source ~$/.$bashrc

$10.$ Display a list of the last $10$ commands executed on your system.