Create A File In Linux Terminal

Hello, I would like to create a text file “Blindtext.txt” under Linux Server ( Ubuntu ), which has a content determined by me. That is, already in the course of creation should be determined what exactly is in the file. (How) does this work? I know how to create a text file, but it should have the content I want. Everything in the area Bash scripting… I find there unfortunately nothing. :/ For help (or even the solution) I would be extremely grateful!

5 replies

Topnutzer in the topic Server When a new file is created, it always has length 0 at first. Only the content makes a file a certain file type. The creation always follows the same scheme. Create file entry / name > open file in write mode > set file position pointer > write data stream (sequence of bytes) to file > close file, file system information is updated (attributes, modification time, size). This scheme is used by every system, it runs automatically on every copy, except databases where the file always stays open. Because of this, it is not possible to create a file that already has contents at the time of creation. Your wish is realized with a multi-step operation, in your case this could be a file copy operation. You have a source file which has your predefined content and you make a copy of this file to the desired destination. Now you have the new, NOT empty destination file with your predefined content. Of course this also works in portions, but the target file remains open and is always updated. So added content will always be appended to the end. It is not possible to insert data into an existing file with a standard file system operation. Even though it may look like this in a word processor, for example, no content is changed in an existing file ! The edited file is always resaved with the new content in its entirety, replacing the previous file. I don’t know why your file has a predefined content and how the data should be processed, but maybe the information will help you to estimate if your plan is now in question by this knowledge…. Beside the possibility with “echo” you can also work with the “HERE_concept”; this means that the content is “here”, i.e. part of a bash file:

cat > /etc/resolv.conf << EOF search Mydomain.local domain Mydomain.local nameserver 192.168.1.1 EOF

Herewith I create (overwrite) the content of the system file, which is important for the name resolution ... it should be clear that only root is allowed to do this! What is after the label "EOF", including the line switches ... up to the "EOF" at the end is written into the file. The string EOF is not prescribed, one can select to a large extent arbitrarily. With "echo -e" you can also write multiline:

echo -e "\nth line\nth line with tab\n3. Line" > Test.txt

In both cases you work with redirections How I know this:Own experience - Intensive work with this for several years now under bash this is the echo command. so directly in your script write echo "hello this text is coming in". of course you can also use variables: echo "the number is $myvariable". echo "create linux text file WITH content?" > dummytext.txt Do you mean like this:

echo -e "Your text\n2. Line" >> Blindtext.txt

What do you want to know?

Like most modern operating systems, Linux provides you with two interfaces for user input. All settings you make via the Graphical User Interface (GUI) can be written in the form of command line commands also via the so-called shell in the form of command line commands. The shell is a program that acts as an interface between the system and the user. interface between the system and the user. It includes a command line interpreter that accepts user input from the keyboard, evaluates it, starts programs if necessary, and returns the output to the user in the form of text output. In addition, each shell has its own programming language that allows shell scripts to be written - for example, to link program calls and facilitate administrative tasks. Each shell runs in a terminal. In the early days of the computer age, independent devices called hardcopy terminals (printer or screen plus keyboard) were used for this purpose. These were replaced on modern computers by so-called terminal emulators terminal emulators. Programs that provide users with a graphical window to interact with the shell. As soon as you call the terminal of your operating system, it starts the default shell defined in the settings (e.g. the Bourne again shell, Bash) and takes input at the so-called prompt (the command prompt). The Bash under Ubuntu: The prompt displays username and hostname

Command	Description
basename	Print filename The command line command basename is passed a file path; it returns only the file name without a prepended path. The syntax of the command is: basename [OPTIONS] path/to/file [SUFFIX]. For example, type $ basename /home/user/image.jpg"real" file path.
lsof	Output open files in the terminal lsof stands for list open filesa utility that displays information about open files sorted by PID (process ID) in the terminal. The call via the terminal is done according to the following scheme: lsof [OPTIONS] Since unixoid systems like Linux follow the principle "Everything is a file", the list given by lsof outputs is correspondingly long. Therefore, options are usually used to limit the output.
md5sum	Calculate checksums With the help of the command line command md5sum can be used to calculate and verify MD5 checksums for files.
mv	Move file or directory The command line program mv (move) copies a file or directory and deletes the original item. If this is done within the same directory, you can use mv can be used to rename files. The program call is based on the following scheme: mv [OPTION] SOURCE DESTINATION An example of use: Move a file to another directory: mv [OPTIONS] SOURCE FILE TARGET Example: mv file1.txt home/user/documents/2017 Move multiple source files to a destination directory: mv [OPTIONS] SOURCE FILE1 SOURCE FILE2 DESTINATION DIRECTORY. Example: mv file1.txt file2.txt home/user/documents/2017 Move subdirectory from current directory to a destination directory: mv [OPTIONS] DIRECTORY_NAME_OLD DIRECTORY_NAME_NEW. Example: mv directory1 home/user/documents/2017 Rename file in current directory: mv [OPTIONS] FILENAME_OLD FILENAME_NEW Example: mv file1.txt file2.txt Rename subdirectory in current directory: mv [OPTIONS] directory_name_old directory_name_new. Example: mv directory1 directory2
paste	Merge file contents column by column Similar to cat the command line program paste allows the output of file contents to standard output. But while cat merely concatenates contents, paste paste concatenates them column by column. The basic scheme of the command is: paste [OPTIONS] FILE1 FILE2 ... In the default mode, the listed files are merged so that all lines with the same line number are transferred to the same line of the output. Each line of the output thus contains contents of all input files. Which separator paste is used can be determined by the option -d option to customize the separator. Tabs are used as the default separator. The option -s (serial) option, a second mode can be activated. In this mode, all lines of the first input file are transferred to the first line of the output. The data of all other input files follow in separate output lines. Each line of the output thus contains only the contents of one input file.
rename	Rename files At rename is a command line utility that allows renaming files and folders using Perl-compatible regular expressions (regex). Unlike mv offers rename is suitable for file operations where the names of several files are to be partially or completely adjusted. Use rename according to the following scheme: rename [OPTIONS] 'REGULAR_EXPRESSION' FILES. Regular expressions conform to the following syntax for replacements: s/SUCHMUSTER/SUBSTITUTION/MODIFIER In the following example all .htmlfile extensions are converted to .xhtml renamed. rename 's/\.html$/.xhtml/' .html*
rm	Delete file or directory The command line program rm (remove) deletes files or whole directories irretrievably. The program call is based on the following scheme: rm [OPTIONS] FILE or rm [OPTIONS] DIRECTORY If a directory including all subdirectories is to be deleted, use rm with the OPTION -R (--recursive). rm -R DIRECTORY Multiple files or directories are separated with spaces. rm [OPTIONS] FILE1 FILE2 ...
shred	Shred files At shred is a command line program that allows secure deletion of files. Selected items are overwritten as part of the deletion process and thus cannot be recovered even by forensic means. The general syntax of the command is: shred [OPTIONS] FILE Use shred with the following options to irretrievably delete a single file: shred -fuz FILE The option -f forces the deletion, -z overwrites the file contents with zeros (default is random data). Finally, -u similarly to the rm-command removes the shredded file from the file system.
sort	Sort file lists and program outputs Use the command line command sortcommand to sort file lists and program output line by line numerically and alphabetically. The general syntax of the command is: sort [OPTIONS] FILE The sorting method can be customized using options: for example, numeric (-n), random (-R) or in reverse order (-r).
split	Split files The command line command split is used to split files. The underlying syntax is: split [OPTIONS] [INPUT [PREFIX]] The placeholder INPUT corresponds to the file to be split. The PREFIX acts as a prefix for the names of the partial files. Their naming is based on the following scheme: PRÄFIXaa, PRÄFIXab, PRÄFIXac ... If no prefix is defined split uses the default prefix x is used. With the option -b (bytes) option can be used to specify the size of the part files. The specification is optionally in bytes (b), kilobytes (k) or megabytes (m). Example: split -b 95m archive.tgz split-archive.tgz. The command split splits the file archive.tgz into partial files of 95 megabytes and names them as follows: split-archive.tar.aa split-archive.tar.ab split-archive.tar.ac Through split to split files using the command line command cat command line command. cat split-archive.tar. > archive.tar*
stat	Output timestamp With the command line command stat (status) can be used to output access and modification timestamps of selected files and directories. The general syntax of the command is: stat [OPTIONS] FILE The output format can be customized using options.
touch	Change timestamp The command line command touch is used to change access and modification timestamps of files. If touch is applied to a non-existent file, the file is created automatically. The command is therefore also suitable for creating empty files. Use touch according to the following scheme: touch [OPTIONS] FILE To set the timestamp of a file to a desired date, use the OPTION -t including the time in the format [YY]MMTThhmm[.ss]. Example: touch -t 1703231037 file.txt Access and modification timestamps are set to March 23, 2017, 10:37. The modification can be done with the options -a and -m to restrict it to access and modification timestamps, respectively. If the command touch command without the -t option, the current timestamp is used.
uniq	Eliminate duplicates infile lists and program outputs The command line command uniq command is usually used in combination with sort to clean sorted files from duplicate lines. In the following example the command sort command is combined by a pipe (\|) with the command uniq to first sort a file and then output it without duplicate lines: sort file.txt \| uniq

Network management

Also the network management is also done conveniently from the terminal under Linux. No matter if you want to check the connection, query DNS information, configure interfaces or transfer files to another computer in the network, with the following programs a single command is enough to put your plan into action.

Archiving and compression

Linux offers various technologies that can be used to package and compress files in archives. It should be noted that not every archiving a compression compression. Thus tar - is a program for archiving files - usually using compression programs like gzip, bzip2 or xz combined. Create A File In Linux Terminal.

Anna Hein

Create A File In Linux Terminal