linux

linux

Automatically List Directory Contents When Changing Directory In Linux

Tuesday, January 28, 2014 - 23:56

When navigating around a Linux box I tend to find I use the same two commands a lot. The first is 'cd' to change a directory, and the second is 'ls' in order to see what is in the new directory. Rather than do this over and over again I decided to look around for a good solution to automate this.

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Copying Files With Secure Copy

Saturday, June 15, 2013 - 19:52

The secure copy command (run using scp) is a Linux command that allows the transfer of files between two computers. This can be locally to a remote server, from a remote server to a local location, or even between two remote servers.

When copying to or from a remote host scp uses ssh for the data transfer. This means that authentication is required, but the files are copied in a secure fashion. When starting a scp request the command first sets up an ssh connection to the remote location, which is then used for the rest of the transfer.

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Uzing Tar To Compress And Uncompress Files

Sunday, February 3, 2013 - 22:13

The tar command can be used to compress or extract one or more files in Linux. A tar file isn't actually a compressed format, instead it is a collection of files within a single file. The tar command can take one or more files, convert them into a tar file and then compress it into a gzip file format. The file created will have the extension tar.gz.

There are a large number of flags that can be used but the main ones for everyday use are.

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SSH Bad Owner Or Permissions Error

Monday, January 21, 2013 - 23:29

After a recent update on Ubuntu I found that I was unable to use ssh due to a strange permissions error to do with the ssh config file. This was quite a problem as I wasn't able to push changes to my git server. The error was as follows:

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Grep For Text In All Files In A Directory

Wednesday, January 16, 2013 - 23:42

Searching all files in a directory and sub-directories for a particular term is really useful and comes in handy in all sorts of situations. It is available on all Linux systems and the basic syntax is as follows.

grep -r -i pattern directory

The -r flag is used to recursively search underneath the given directory and the -i flag is used to ignore case. The pattern is a normal regular expression, which can be changed to an extended set by using the -E flag.

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Creating Mac OSX Aliases

Saturday, November 10, 2012 - 21:01

Adding an alias to your system is a good way of saving time when remembering complex commands. You can reduce a command down to a quick two letter command that is easy to remember.

The alias command can be used to assign an alias on the fly. You can create an alias to 'ls -lah' by typing in the following into the command line.

alias ll="ls -lah"

Now, when you type 'll' you will actually run the command 'ls -la'.

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