Postoji nekoliko opcija za sigurnosno kopiranje vaših podataka u Linuxu^(Linux) . Možete koristiti neke besplatno dostupne softverske programe, kao što su fwbackups i Sbackup . Međutim, postoji jednostavan način izrade sigurnosne kopije direktorija bez instaliranja dodatnog softvera.

Napravit ćemo shell skriptu pomoću varijabli, naredbe tar i naredbe ^(tar)date za kreiranje datoteke sigurnosne kopije s datumom direktorija, s njegovim poddirektorijima.

Shell skripta je u biti datoteka koja sadrži popis naredbi koje se izvode u nizu. Ako imate niz naredbi koje redovito izvodite po redu, korisno je stvoriti shell skriptu koja sadrži te naredbe. Zatim morate samo pokrenuti datoteku skripte da biste pokrenuli naredbe.

Stvaranje datoteke shell skripte

Za ovaj primjer, kreirat ćemo shell skriptu za sigurnosnu kopiju direktorija koji sadrži datoteke za korisnički vodič. Koristimo Gnome okruženje u Ubuntu .

Najprije pristupite svom početnom imeniku odabirom Početna mapa^{(Home Folder)} s izbornika Mjesta^(Places) . Preglednik datoteka^{(File Browser)} otvara se u vašem matičnom direktoriju.

Napravit ćemo novu praznu datoteku u koju ćemo unijeti naredbe za izradu sigurnosne kopije. Desnom tipkom miša kliknite^{(Right-click)} u desnom oknu i odaberite Create Document | Empty File iz skočnog izbornika.

Datoteka je dodana na popis i spremna je za preimenovanje. Upišite^(Type) naziv datoteke, dajući datoteci ekstenziju .sh .

Za ovaj primjer, našu smo datoteku nazvali user_guide_backups.sh^{(user_guide_backups.sh)} .

Sada moramo dodati naredbe u datoteku. Desnom tipkom miša kliknite naziv datoteke i na skočnom izborniku odaberite Otvori s geditom .^{(Open with gedit)}

Datoteka se otvara u geditu^(gedit) . Unesite sljedeće retke u datoteku i kliknite Spremi^(Save) . Svrha svake linije navedena je u nastavku.

NAPOMENA:^(NOTE:) Također možete kopirati sljedeći tekst i zalijepiti ga u gedit . Svakako promijenite <username> u svoje korisničko ime.

#!/bin/bash
 SRCDIR="/home/<username>/Documents/my_work/"
 DESTDIR="/home/<username>/Backups/"
 FILENAME=ug-$(date +%-Y%-m%-d)-$(date +%-T).tgz
 tar – create – gzip – file=$DESTDIR$FILENAME $SRCDIR

Redak po redak opis

Sljedeća tablica opisuje što je svaki redak u datoteci skripte ljuske.

Line #	Description
1	This line must be the first line in a bash shell script, which is the default type of script.
2	This line sets up a variable called SRCDIR and sets the value of it to the directory to be backed up. NOTE: Be sure to replace <username> with your username.
3	This line sets up a variable called DESTDIR and sets the value of it to the directory into which the backup file will be written. NOTE: Be sure to replace <username> with your username.
4	This line sets up a variable called FILENAME and sets the value using text and variables containing the date command to add the current date and time to the filename. For example, the filename might be ug-20100212-13:03:45.tgz. NOTE: When using a variable, always start it with the dollar sign ($). If you use a command as part of a variable, enclose the command and the options for the command in parentheses.
5	This line is the tar command with the following function and options added. –create This function creates a new archive (or truncates an old one if the filename specified already exists) and writes the named files or directory to it. –gzip This option tells tar to compress the files in the archive using the gzip utility. –file This option gives tar the filename to use. In this case, we assembled the filename using the DESTDIR, FILENAME, and SRCDIR variables.

Uređivanje dopuštenja^{(Permissions)} u datoteci Shell Script^{(Shell Script File)}

Prije pokretanja skripte morate provjeriti ima li datoteka ispravna dopuštenja. Da biste to učinili, ponovno otvorite svoju početnu mapu^{(Home Folder)} kao što je gore spomenuto i desnom tipkom miša kliknite datoteku skripte ljuske. Na skočnom izborniku odaberite Svojstva .^(Properties)

Prikazuje se dijaloški okvir Svojstva . ^(Properties)Provjerite^(Make) je li označen potvrdni okvir Izvrši .^(Execute)

Kliknite Zatvori^(Close) .

Pokretanje shell skripte

Da biste pokrenuli skriptu ljuske, otvorite prozor terminala odabirom Accessories | Terminal iz izbornika Aplikacije^{(Applications)} .

Kada se otvori prozor terminala^(Terminal) , prema zadanim postavkama trebali biste biti u početnoj mapi^{(Home Folder)} . Upisivanjem pwd u naredbeni redak i pritiskom na enter potvrđuje se ova činjenica. Na upit upišite ./user_guide_backups.sh i pritisnite Enter .

Trebali biste imati .tgz datoteku u mapi Sigurnosne kopije^(Backups) u vašoj početnoj mapi^{(Home Folder)} . Ako desnom tipkom miša kliknete naziv datoteke, vidjet ćete nekoliko opcija za otvaranje arhive u jednom od dostupnih programa za arhiviranje ili ekstrahiranje datoteka izravno u mapu Sigurnosne kopije pomoću naredbe ^(Backups)Izdvoj ovdje^{(Extract Here )} .

Više informacija

Poveznice u nastavku pružaju više informacija o shell skriptama, naredbama tar i date i drugim naredbama Linuxa^(Linux) .

Skriptiranje

Brzi vodič za pisanje skripti pomoću bash ljuske^{(A quick guide to writing scripts using the bash shell)}

Bash Shell Scripting – 10 Seconds Guide | All about Linux

Bash referentni priručnik^{(Bash Reference Manual)}

Linux naredbe

tar MAN Stranica^{(tar MAN Page)}

datum MAN Stranica^{(date MAN Page)}

bash naredbe – Linux MAN stranice^{(bash commands – Linux MAN Pages)}

Istraživanje ovih stranica pomoći će vam da izradite vlastite korisne bash shell skripte.

Back Up a Directory in Linux using a Shell Script

Τherе are several options for backing υp your data in Linux. You can use some freely available software programѕ, such as fwbackups and Sbackup. However, there is a simple method of backing up a directory without installing any extra software.

We will create a shell script using variables, the tar command and the date command to create a dated backup file of a directory, with its subdirectories.

A shell script is essentially a file containing a list of commands that are run in sequence. If you have a series of commands you regularly run in order, it is helpful to create a shell script containing these commands. Then, you only have to run the script file to run the commands.

Creating the Shell Script File

For this example, we are going to create a shell script to backup a directory containing files for a user guide. We are using the Gnome environment in Ubuntu.

First, access your home directory, by selecting Home Folder from the Places menu. The File Browser opens to your home directory.

We are going to create a new empty file in which we will enter the commands for performing the backup. Right-click in the right pane and select Create Document | Empty File from the pop-up menu.

A file is added to the list and is ready to be renamed. Type in a name for the file, giving the file an extension of .sh.

For this example, we named our file user_guide_backups.sh.

Now we need to add the commands to the file. Right-click on the name of the file and select Open with gedit from the pop-up menu.

The file opens in gedit. Enter the following lines into the file and click Save. The purpose of each line is listed below.

NOTE: You can also copy the following text and paste it into gedit. Be sure to change <username> to your username.

#!/bin/bash
 SRCDIR="/home/<username>/Documents/my_work/"
 DESTDIR="/home/<username>/Backups/"
 FILENAME=ug-$(date +%-Y%-m%-d)-$(date +%-T).tgz
 tar – create – gzip – file=$DESTDIR$FILENAME $SRCDIR

Line-by-Line Description

The following table describes what each line is in the shell script file.

Line #	Description
1	This line must be the first line in a bash shell script, which is the default type of script.
2	This line sets up a variable called SRCDIR and sets the value of it to the directory to be backed up. NOTE: Be sure to replace <username> with your username.
3	This line sets up a variable called DESTDIR and sets the value of it to the directory into which the backup file will be written. NOTE: Be sure to replace <username> with your username.
4	This line sets up a variable called FILENAME and sets the value using text and variables containing the date command to add the current date and time to the filename. For example, the filename might be ug-20100212-13:03:45.tgz. NOTE: When using a variable, always start it with the dollar sign ($). If you use a command as part of a variable, enclose the command and the options for the command in parentheses.
5	This line is the tar command with the following function and options added. –create This function creates a new archive (or truncates an old one if the filename specified already exists) and writes the named files or directory to it. –gzip This option tells tar to compress the files in the archive using the gzip utility. –file This option gives tar the filename to use. In this case, we assembled the filename using the DESTDIR, FILENAME, and SRCDIR variables.

Editing the Permissions on the Shell Script File

Before running your script, you need to make sure the file has the correct permissions. To do this, open your Home Folder again as mentioned above and right-click on the shell script file. Select Properties from the pop-up menu.

The Properties dialog box displays. Make sure the Execute check box is selected.

Click Close.

Running the Shell Script

To run the shell script, open a terminal window by selecting Accessories | Terminal from the Applications menu.

When the Terminal window opens, you should be in your Home Folder by default. Typing pwd on the command line and pressing enter confirms this fact. At the prompt, type ./user_guide_backups.sh and press Enter.

You should have a .tgz file in the Backups folder in your Home Folder. If you right-click on the filename, you see several options for opening the archive in one of the available archiving programs, or extracting the files directly to the Backups folder using the Extract Here command.

More information

The links below provide more information about shell scripts, the tar and date commands, and other Linux commands.

Scripting

A quick guide to writing scripts using the bash shell

Bash Shell Scripting – 10 Seconds Guide | All about Linux

Bash Reference Manual

Linux Commands

tar MAN Page

date MAN Page

bash commands – Linux MAN Pages

Exploring these pages will help you to construct your own useful bash shell scripts.

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