Chapter 5 — Permissions and sudo — 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
whoami
sudo whoami
 
# 2
touch secret.txt
ls -l secret.txt
 
# 3
chmod u=rw,g=,o= secret.txt
ls -l secret.txt
 
# 4
echo 'echo "Hello from my script"' > hello.sh
 
# 5
./hello.sh
 
# 6
chmod u+x hello.sh
./hello.sh
 
# 7
chmod u-x hello.sh
ls -l hello.sh

output of 3:

-rw------- 1 ati ati 0 Aug 9 14:20 secret.txt

output of 5:

bash: ./hello.sh: Permission denied

output of 6:

Hello from my script

output of 7:

-rw-r--r-- 1 ati ati 34 Aug 9 14:22 hello.sh

• in step 3 notice that g= and o= with nothing after the = is how u say “no permission at all”.
• in step 4 the outer quotes are single ' so that the inner double quotes survive into the file.

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