Chapter 3 — Files and Navigation — Solutions

do the assignment first. reading the answer is not the same as doing it, and u will feel like u learned it when u didn’t.

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# 1
cd ~
pwd
 
# 2
mkdir ch3-practice
cd ch3-practice
 
# 3
touch one.txt two.txt three.txt
 
# 4
echo "Mohamed Ati" > one.txt
cat one.txt
 
# 5
mv two.txt renamed.txt
 
# 6
mkdir backup
cp *.txt backup/
 
# 7
head -n 2 one.txt
 
# 8
echo *.txt
 
# 9
touch file1.txt file2.txt file10.txt
ls file?.txt
 
# 10
cd ~
rm -rf ch3-practice

output of 6, to check it worked:

ls backup

one.txt  renamed.txt  three.txt

output of 8:

one.txt renamed.txt three.txt

output of 9:

file1.txt  file2.txt

• in step 4 the > is redirecting the output of echo into the file instead of the screen, we learn it properly in Chapter 8.
• in step 8, look at what came back. echo knows nothing about files, it only printed what the shell handed it. that is the wildcard being expanded before the command runs.
• in step 9, file10.txt is missing from the result on purpose. ? is exactly one character and 10 is two.
• in step 10 notice we go out of the dir first with cd ~, u can not delete the dir u are standing inside.

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