command_notes.md

Number 6: Using file roster.txt, this is all the hw it starts at 6

Part a:

Produce an output file roster_sort_lastName.txt that lists the class members in alphabetical order of their last names, together with the rest of the fields:

• sort roster.txt > roster_sort_lastName.txt

Now using roster_sort_lastName.txt as input, produce three output files. First, produce roster_sort_lastName_lastName.txt which displays only the last name in each row (i.e., no first name and no email):

• cut -d' ' -f1 roster_sort_lastName.txt > roster_sort_lastName_lastName.txt

Next, produce an output file roster_sort_lastName_firstLastNames.txt which displays both the last and first name only in each row (i.e., no email):

• awk NF=2 roster_sort_lastName.txt > roster_sort_lastName_firstLastNames.txt

and finally roster_sort_lastName_firstNameEmail.txt which displays only the first name and email in each row (i.e., no last name)

• cut -d' ' -f2- roster_sort_lastName.txt > roster_sort_lastName_firstNameEmail.txt

Part b:

Produce an output file roster_sort_firstName.txt that lists the class members in alphabetical order of their first names together with the rest of the fields in order

• sort -k2 roster_sort_lastName.txt > roster_sort_firstName.txt

Using roster_sort_firstName.txt as input, produce an output file roster_sort_firstName_firstName.txt which displays only the first name in each row (i.e., no last name and no email)

• awk '{print $2}' roster_sort_firstName.txt > roster_sort_firstName_firstName.txt

Next, produce an output file roster_sort_firstName_firstLastNames.txt which displays both the first and last name in order in each row (i.e., no email)

• awk '{print $2,$1}' roster_sort_firstName.txt > roster_sort_firstName_firstLastNames.txt

Finally, produce an output file roster_sort_firstName_lastNameEmail.txt which displays the last name and email in each row (i.e., no first name)

• awk '{print $1,$3}' roster_sort_firstName.txt > roster_sort_firstName_lastNameEmail.txt

Part c:

Using roster.txt as input, produce an output file roster_sort_lastName_noDuplicate.txt sorted by last name with all duplicate students removed (hint: use sort and uniq commands)

• sort roster.txt | uniq > roster_sort_lastName_noDuplicate.txt

Part d:

Write a one-line Bash command that counts the number of enrolled students, using roster_sort_lastName_noDuplicate.txt as input

• wc -l roster_sort_lastName_noDuplicate.txt

Part e:

Count how many students whose last names start with C or D are enrolled in the class. Save any output to prob6_e_answer.txt

• grep -i '^[C-D]' roster_sort_lastName_noDuplicate.txt | wc -l > prob6_e_answer.txt

Part f:

Produce a list of students whose last names start with L or S in reverse alphabetical order. Save your output to prob6_f_answer.txt

• grep -i '^L\|^S' roster_sort_lastName_noDuplicate.txt | sort -r > prob6_f_answer.txt

Number 7

Part a: add the following to your .bashrc

• export AM129_PATH='/home/drixit/2022Projects/pichardomichelle-am129-fall2022'

Part b: add the following to your .bashrc

• alias wcl='wc -l'

Extra

Path commands: add the following to your .bashrc

• export SCOMP_PATH='/home/drixit/2022Projects/Scientific-Computing-'
• export ECENOTES_PATH='/home/drixit/2022Projects/ECE8-Robotics-Notetaker'

Editors: add the following to your .bashrc

• alias vs='code -r'
• alias cl='clear'

Reduce the working directory in-terminal: add the following to your .bashrc

• PROMPT_DIRTRIM=1

Number 8: add the following to your .bashrc

• Added provided code
  function cd_up() {
  cd $(printf "%0.0s../" $(seq 1 $1));
  }
  alias 'cd..'='cd_up'

• Find a way to write a routine that tells you the pwd on N levels upper directory location s.t you do not move from your present location.

Print upper dir: add the following to your .bashrc

function pwd_up() {
    CURRENTDIR=$(pwd);
    cd \$(printf "%0.0s../" $(seq 1 $1));
    pwd;
    cd $CURRENTDIR;
}
alias 'pwd..'='pwd_up'

Number 9:

• Created a README.md with provided text
• added #!/usr/bin/more to the top line
• ran the following commands,
  • mv README README.sh
  • chmod a+x README.sh
• this created an executable file from the markdown and the text appeared in terminal
• the file changed from -rw-r--r-- to -rwxr-xr-x
• To execute run: ./README.sh