Training, Open Source Programming Languages

This is page http://www.wellho.net/mouth/1225_Per ... dling.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.
Perl - functions for directory handling

Perl has many built in functions for file and directory handling and you should use them in preference to shelling out in your scripts because:

• They work across operating systems (at least as far as is practical)

• They are much more efficient as there's no extra processes being started and stopped all the time.

I've added a source code sample to our web site which shows some of these in use ...

cwd to find out where you are
chdir to change your current directory
-d to check is a symbol is a directory
opendir and readdir to read through a directory's content

Sample output:

earth-wind-and-fire:~ grahamellis$ perl chdirddemo
We are in /Users/grahamellis
We are now in /Users/grahamellis/jun07
Directory entry count: 24
We are now in /Users/grahamellis
Directory entry count: 390
earth-wind-and-fire:~ grahamellis$

(written 2007-06-09, updated 2007-06-12)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P602 - Perl - Advanced File and Directory Handling
  [839] Reporting on the 10 largest files or 10 top scores - (2006-08-20)
  [975] Answering ALL the delegate's Perl questions - (2006-12-09)
  [1709] There is more that one way - Perl - (2008-07-14)
  [1832] Processing all files in a directory - Perl - (2008-10-11)
  [1861] Reactive (dynamic) formatting in Perl - (2008-10-31)
  [2876] Different perl examples - some corners I rarely explore - (2010-07-18)
  [3412] Handling binary data in Perl is easy! - (2011-08-30)
  [3429] Searching through all the files in or below a directory - Ruby, Tcl, Perl - (2011-09-09)

P215 - Perl - More about Files
  [2405] But I am reading from a file - no need to prompt (Perl) - (2009-09-14)
  [2964] An introduction to file handling in programs - buffering, standard in and out, and file handles - (2010-09-21)
  [3320] Reading the nth line from a file (Perl and Tcl examples) - (2011-06-09)
  [3839] Spraying data from one incoming to series of outgoing files in Perl - (2012-08-15)


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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.

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