Training, Open Source Programming Languages

This is page http://www.wellho.net/mouth/2300_Wha ... mean-.html

Our email: info@wellho.net • Phone: 01144 1225 708225

 
For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
What does x on a linux directory mean?

Trick question (I don't ask too many, I hope ... and those that I do ask are designed to be thought provoking):

What does the x bit in permission strings mean?

Most delegates who've done a bit of Unix or Linux before will tell me it's the exexcutable bit - says whether a file can be run as a program direct from the command line, and for a plain file they are correct. But for a directory, it means Access of should I say Axess?

One a directory, the r setting still means "readable" but without the x set on, I can only read the file names - I cannot access the full details of each file, nor can I delve deeper into the directory.

To illustrate this, I temporarily turns the "x" off on one of my directories and did some directory listings:

[trainee@easterton ~]$ chmod a-x dbn
[trainee@easterton ~]$ ls dbn
dbn/ac_20090716 dbn/mediawiki-1.14.0.tar.gz
dbn/apache-tomcat-5.5.27.tar.gz dbn/mysql-5.1.34-linux-i686-glibc23.tar.gz
dbn/httpd-2.2.11.tar.gz dbn/palace_of_westminster.jpg
dbn/jdk-6u14-linux-i586.bin dbn/php-5.2.9.tar.gz
dbn/latmjdemo.war dbn/somewhere_else
dbn/mediawiki-1.13.5.tar.gz
[trainee@easterton ~]$ ls -l dbn
total 0
?--------- ? ? ? ? ? dbn/ac_20090716
?--------- ? ? ? ? ? dbn/apache-tomcat-5.5.27.tar.gz
?--------- ? ? ? ? ? dbn/httpd-2.2.11.tar.gz
?--------- ? ? ? ? ? dbn/jdk-6u14-linux-i586.bin
?--------- ? ? ? ? ? dbn/latmjdemo.war
?--------- ? ? ? ? ? dbn/mediawiki-1.13.5.tar.gz
?--------- ? ? ? ? ? dbn/mediawiki-1.14.0.tar.gz
?--------- ? ? ? ? ? dbn/mysql-5.1.34-linux-i686-glibc23.tar.gz
?--------- ? ? ? ? ? dbn/palace_of_westminster.jpg
?--------- ? ? ? ? ? dbn/php-5.2.9.tar.gz
?--------- ? ? ? ? ? dbn/somewhere_else


and as you can see, you're able to see what's there, but not do much more.

Is this used / useful? There are places within the operating system that you'll find one just one of r and x on a directory, but advise for newcomers on our Linux Basics course is that - for a directory - you should normally treat them as a pair.
(written 2009-07-21, updated 2009-07-23)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A101 - Web Application Deployment - Linux -An Introduction For Users
  [73] vi - full circle - (2004-10-04)
  [74] pushd and popd - (2004-10-05)
  [152] Aladdin, or careful what you wish. - (2004-12-15)
  [249] An easy way out - (2005-03-17)
  [430] Linux commands - some basics - (2005-08-31)
  [431] File permissions of Linux and Unix systems - (2005-08-31)
  [593] Finding where the disc space has gone - (2006-02-06)
  [659] Web Application Components - (2006-03-28)
  [679] More or less on the edge of the page - (2006-04-11)
  [703] Copying files and preserving ownership - (2006-04-28)
  [710] Linux training Glasgow, Python programming course Dundee - (2006-05-05)
  [711] THE home directory or MY home directory - (2006-05-06)
  [749] Cottage industry or production line data handling methods - (2006-06-07)
  [984] Cardinal numbers and magic numbers - (2006-12-14)
  [1012] Moving files between Windows / DOS and Linux / Unix - (2006-12-30)
  [1013] Copy multiple files - confusing error message from cp - (2006-12-30)
  [1068] ls -l report, Linux / Unix - types and permssions - (2007-02-06)
  [1259] Where am I and how did I get here? - (2007-07-05)
  [1287] Work and play at Well House Manor - Football and Shell Shortcuts - (2007-08-02)
  [1288] Linux run states, shell special commands, and directory structures - (2007-08-03)
  [1366] awk - a powerful data extraction and manipulation tool - (2007-09-25)
  [1408] Wireless hotel tips - FTP and Skype connections failing - (2007-10-26)
  [1438] Copy and paste / cut and paste and other vi techniques - (2007-11-20)
  [1527] Selecting file names in a shell - one word or another - (2008-02-02)
  [1651] ls command - favourite options - (2008-05-23)
  [1764] Yank and Push - copy and move in vi - (2008-08-21)
  [1803] FTP passive mode - a sometimes cure for upload hangs - (2008-09-20)
  [1893] Some Linux and Unix tips - (2008-11-18)
  [1897] Keeping on an even keel - (2008-11-21)
  [1902] sstrwxrwxrwx - Unix and Linux file permissions - (2008-11-23)
  [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23)
  [2201] Running straight from the jar, but not from a tar - (2009-05-26)
  [2203] Always use su with minus. And where do programs come from? - (2009-05-27)
  [2299] How much space does my directory take - Linux - (2009-07-20)
  [2479] Accidentally typed ci rather than vi? - (2009-10-27)
  [2494] Making Linux Politically correct - (2009-11-06)
  [2636] Linux - useful tips including history and file name completion - (2010-02-15)
  [2831] Recording (a macro) in vi - (2010-06-27)
  [3179] Oops - I typed ci not vi, and have lost my file ... - (2011-02-21)
  [3256] Displaying a directory or file system tree - Linux - (2011-04-22)
  [3791] The Kernel, Shells and Daemons. Greek Gods in computing - (2012-07-01)
  [3819] Packing a tar, jar or war file - best practise - (2012-07-26)


Back to
How much space does my directory take - Linux
Previous and next
or
Horse's mouth home
Forward to
Mistaken identity?
Some other Articles
Extracting real data from an exported file in PHP or Perl
Turning potential customers away
See us at the West Wilts Show
Mistaken identity?
What does x on a linux directory mean?
Melksham Carnival Parade - the people
Standing on the corner, Melksham Carnival
Variable scope - what is it, and how does it Ruby?
The dog is not in trouble
4759 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per page


This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).

© WELL HOUSE CONSULTANTS LTD., 2021: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/mouth/2300_Wha ... mean-.html • PAGE BUILT: Sun Oct 11 16:07:41 2020 • BUILD SYSTEM: JelliaJamb