Der er flere muligheder for at sikkerhedskopiere dine data i Linux . Du kan bruge nogle frit tilgængelige softwareprogrammer, såsom fwbackups og Sbackup . Der er dog en simpel metode til at sikkerhedskopiere en mappe uden at installere ekstra software.

Vi vil oprette et shell-script ved hjælp af variabler, tar - kommandoen og date -kommandoen for at oprette en dateret backup-fil af en mappe med dens undermapper.

Et shell-script er i det væsentlige en fil, der indeholder en liste over kommandoer, der køres i rækkefølge. Hvis du har en række kommandoer, du regelmæssigt kører i rækkefølge, er det nyttigt at oprette et shell-script, der indeholder disse kommandoer. Derefter skal du kun køre scriptfilen for at køre kommandoerne.

Oprettelse af Shell Script-filen

For dette eksempel skal vi oprette et shell-script til at sikkerhedskopiere en mappe, der indeholder filer til en brugervejledning. Vi bruger Gnome- miljøet i Ubuntu .

Få først adgang til din hjemmemappe ved at vælge Hjemmappe^{(Home Folder)} i menuen Steder^(Places) . Filbrowseren^{(File Browser)} åbner til din hjemmemappe .

Vi vil oprette en ny tom fil, hvor vi indtaster kommandoerne til at udføre sikkerhedskopieringen. Højreklik^{(Right-click)} i højre rude, og vælg Create Document | Empty File fra pop op-menuen.

En fil føjes til listen og er klar til at blive omdøbt. Indtast^(Type) et navn til filen, og giv filen filtypenavnet .sh .

Til dette eksempel navngav vi vores fil user_guide_backups.sh .

Nu skal vi tilføje kommandoerne til filen. Højreklik på filens navn, og vælg Åbn med gedit^{(Open with gedit)} fra pop op-menuen.

Filen åbnes i gedit . Indtast følgende linjer i filen, og klik på Gem^(Save) . Formålet med hver linje er angivet nedenfor.

BEMÆRK:^(NOTE:) Du kan også kopiere følgende tekst og indsætte den i gedit . Sørg for at ændre <username> til dit brugernavn.

#!/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

Linje-for-linje beskrivelse

Følgende tabel beskriver, hvad hver linje er i shell-scriptfilen.

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.

Redigering af tilladelserne^{(Permissions)} på Shell Script-filen^{(Shell Script File)}

Før du kører dit script, skal du sikre dig, at filen har de korrekte tilladelser. For at gøre dette skal du åbne din hjemmemappe^{(Home Folder)} igen som nævnt ovenfor og højreklikke på shell-script-filen. Vælg Egenskaber^(Properties) fra pop op-menuen.

Dialogboksen Egenskaber^(Properties) vises. Sørg^(Make) for, at afkrydsningsfeltet Udfør^(Execute) er markeret.

Klik på Luk^(Close) .

Kører Shell-scriptet

For at køre shell-scriptet skal du åbne et terminalvindue ved at vælge Accessories | Terminal fra menuen Programmer^{(Applications)} .

Når terminalvinduet^(Terminal) åbnes, skal du som standard være i din hjemmemappe^{(Home Folder)} . At skrive pwd på kommandolinjen og trykke på enter bekræfter dette faktum. Ved prompten skal du skrive ./user_guide_backups.sh og trykke på Enter .

Du bør have en .tgz -fil i mappen Backups i din hjemmemappe^{(Home Folder)} . Hvis du højreklikker på filnavnet, ser du flere muligheder for at åbne arkivet i et af de tilgængelige arkiveringsprogrammer eller udpakke filerne direkte til mappen Backups ved at bruge kommandoen Udpak her .^{(Extract Here )}

Mere information

Linkene nedenfor giver mere information om shell-scripts, tar- og date -kommandoer og andre Linux -kommandoer.

Scripting

En hurtig guide til at skrive scripts ved hjælp af bash-skallen^{(A quick guide to writing scripts using the bash shell)}

Bash Shell Scripting – 10 Seconds Guide | All about Linux

Bash referencemanual

Linux kommandoer

tar MAN Side^{(tar MAN Page)}

dato MAN Side^{(date MAN Page)}

bash-kommandoer – Linux MAN-sider^{(bash commands – Linux MAN Pages)}

At udforske disse sider vil hjælpe dig med at konstruere dine egne nyttige bash shell-scripts.

Back Up a Directory in Linux using a Shell Script

There are seνeral options for bаcking up your data in Linux. You can use some freely available software programs, 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.

Related posts

• Sådan navigerer og bruger du Linux Directory-strukturen

• Linux FIND-kommando med eksempler

• 5 gode grunde til at droppe Windows til Linux

• HDG forklarer: Hvad er UNIX?

• 9 bedste Linux-distros til hacking

• Sådan installeres og køres Linux-apps på en Chromebook

• Brug Linux 'dd'-kommandoen med en simpel GUI

• Sluk og genstart din computer fra Ubuntu-terminalen

• 10 bedste skærmoptagere til Linux

• Vis og skjul skrivebordsikoner i GNOME Linux

• 7 måder at zippe og udpakke filer i Linux

• Opret din egen Live Video Streaming Server med Linux

• Den nemmeste måde at fjernoprette forbindelse til Linux Mint fra ethvert operativsystem

• Forstå Linux-tilladelser og chmod-brug

• De 20 bedste Linux-apps nogensinde

• Find og skift dit værtsnavn i Ubuntu

• Sådan opsætter og konfigurerer du TCP/IP-filer på Linux (TCP/IP-indstillinger for Linux)

• De 5 Top Linux Distros, du bør bruge

• Hvad er inoder i Linux, og hvordan bruges de?

• Tilføj genveje til højreklik-kontekstmenuen i Ubuntu