Linux:Filters
(Változatok közti eltérés) (→Filters) |
(→Filters) |
||
67. sor: | 67. sor: | ||
feri@columbo:~$ cat /etc/passwd | grep ^f | feri@columbo:~$ cat /etc/passwd | grep ^f | ||
</code></megoldas> | </code></megoldas> | ||
- | * Show all lines from the /etc/passwd which login name dont't contain | + | * Show all lines from the /etc/passwd which login name dont't contain feri! <megoldas> |
<code lang="bash"> | <code lang="bash"> | ||
- | feri@columbo:~$ cat /etc/passwd | cut -d: -f1 | grep -v | + | feri@columbo:~$ cat /etc/passwd | cut -d: -f1 | grep -v feri |
</code></megoldas> | </code></megoldas> | ||
* Show all lines from the /etc/passwd which contains in the login name field the root user! <megoldas> | * Show all lines from the /etc/passwd which contains in the login name field the root user! <megoldas> |
A lap 2021. március 11., 08:17-kori változata
Redirections
Kivonat: >, >>, <
- Redirect the output of the ls command to the /tmp/lista-<username>.txt file, where the <username> is your login name!
- Concatenate all files in the /etc directory which have .conf extension to one big file in named /tmp/lista-<username>.txt! What happened its previous content?
- Append the current date and time to the end of the /tmp/lista-<username>.txt!
- Create this new directory: /tmp! Redirect the error message into the hiba.txt!
Filters
Kivonat: grep, cut, wc, head, tail, tr, sort, uniq, tee, more (less, most), tac
- Show the content of /etc/passwd page by page!
- Show all lines from the /etc/passwd which contain the sh string!
- Show all lines from the /etc/passwd which don't contain the sh string!
- Show all lines from the /etc/passwd which first character is s!
- Show all lines from the /etc/passwd which last part is false!
- Show all lines from the /etc/passwd which login name starts with f!
- Show all lines from the /etc/passwd which login name dont't contain feri!
- Show all lines from the /etc/passwd which contains in the login name field the root user!
- how many users are in that system whose name start with a vocal letter? Do not make difference between uppercase and lowercase letters!
- How many user are there without a bash shell?
- Show all lines from /etc/bash.bashrc which aren't comments and aren't empty! (Comments start with #, empty lines are ^$)!
- Write the output of the previous task to your home directory into the bash.txt file!
- How many folders are in the /etc which group right are: r-x?
- Show the login history of the root (in this month)!
- Is the root user logged in the system?
- How many different shell exists in the system?
- Show the name of all logged users! If somebody logged in more than once, only one name should be listed!
- Which users has logged in this month except the reboot user?
- List the name of all users in a sorted list!
- How many lines start in the /etc/passwd with f?
- Show the first three lines of the /etc/passwd file!
- Show the last seven lines of the /etc/passwd file!
- Show the first twelwe and the last twelve names from the list of users! Try to solve this with one line!
- Which user logged in first in this month?
- How many lines does have the /etc/passwd file?
- How many characters are in the /etc/passwd file last 8 lines?
- How many characters are in the directory of the /etc folder?
- How many times has the root logged in this month?
- show the sorted content of /etc/passwd!
- Show all UIDs from the /etc/passwd in reverse order!
- Which is the biggest UID in the /etc/passwd file?
- Show the first 15 lines in ascending order from the /etc/passwd!
- How many lines and how many characters are in the output of the previous command?
- Show all real names from the /etc/passwd file and replace all spaces to a _ character!
- Delete all j character from the list of users!