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Fix Alt Tab task switching in GNOME Shell

Ryan — Mon, 21 Mar 2011 02:44:05 +0000

If you are using GNOME Shell with the latest Gnome 3 you may be wondering why you cannot Alt+Tab through your running applications. This is especially important since the panel and task bar no longer exists, making switching between applications especially difficult. To enable task switching with Alt+Tab you must configure metacity to support this with gconf-editor.

Hit Alt+F2 and type gconf-editor.

Now navigate to the switch_windows key binding.
apps -> metacity -> global_keybindings -> switch_windows

The default value is set to Disabled. Change this to <Alt>Tab instead. Now exit the editor and task switching should be enabled.

Format output with the column utility

Ryan — Sat, 29 Jan 2011 11:19:04 +0000

The column utility is helpful for taking raw data and formatting it in a way that is easier for humans to comprehend. It can take a single column of data and format it into many equally spaced columns. Alternatively it can format multiple rows of data into tables.

In our first example we have a numfile which contains 20 numbers, one on each line, which we output with cat.

$ cat numfile1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

The output is long and you can quickly see with a larger example that the numbers would scroll off the screen. When we pipe this same output to the column command the output is broken into columns and is evenly distributed across the screen.

$ cat numfile | column1 3 5 7 9 11 13 15 17 19 2 4 6 8 10 12 14 16 18 20

The ‘-t’ option determines the number of columns the input contains and creates a table. This is helpful when you have data where the fields have various lengths. A good example to demonstrate this is the white space delimited output from /etc/mtab.

$ cat /etc/mtabproc /proc proc rw,noexec,nosuid,nodev 0 0 none /sys sysfs rw,noexec,nosuid,nodev 0 0 fusectl /sys/fs/fuse/connections fusectl rw 0 0 none /sys/kernel/debug debugfs rw 0 0 none /sys/kernel/security securityfs rw 0 0 none /dev devtmpfs rw,mode=0755 0 0 none /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0 none /dev/shm tmpfs rw,nosuid,nodev 0 0 none /var/run tmpfs rw,nosuid,mode=0755 0 0 none /var/lock tmpfs rw,noexec,nosuid,nodev 0 0 none /var/lib/ureadahead/debugfs debugfs rw,relatime 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0

With the same output piped to column. the resulting table is much more readable.

$ cat /etc/mtab | column -tproc /proc proc rw,noexec,nosuid,nodev 0 0 none /sys sysfs rw,noexec,nosuid,nodev 0 0 fusectl /sys/fs/fuse/connections fusectl rw 0 0 none /sys/kernel/debug debugfs rw 0 0 none /sys/kernel/security securityfs rw 0 0 none /dev devtmpfs rw,mode=0755 0 0 none /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0 none /dev/shm tmpfs rw,nosuid,nodev 0 0 none /var/run tmpfs rw,nosuid,mode=0755 0 0 none /var/lock tmpfs rw,noexec,nosuid,nodev 0 0 none /var/lib/ureadahead/debugfs debugfs rw,relatime 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0

Firefox Keyboard Shortcuts

Ryan — Sat, 29 Nov 2008 03:49:05 +0000

This is the list of the most useful Firefox keyboard shortcuts. It is amazing how much more efficient you can be when your not always reaching for your mouse.

Controlling Tabs

New Tab – Ctrl+T
Close Tab – Ctrl+W or Ctrl+F4
Next Tab – Ctrl+Tab or Ctrl+PageDown
Previous Tab – Ctrl+Shft+Tab or Ctrl+PageUp
Select Tab [1 to 9] – Ctrl+[1 to 9]

Searching Text

Find in This Page – Ctrl+F
Find Again – Ctrl+G or F3
Find Previous – Ctrl+Shft+G or Shft+F3

Other Commands

Full Screen – F11
Reload – F5 or Ctrl+R
Reload (override cache) – Ctrl+F5 or Ctrl+Shft+R
Select All – Ctrl+A