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+Unix shell equivalents
+----------------------
+
+StepTalk is not meant to be used for tasks that can be done using ordinary Unix
+shells. But this does not mean, that it cannot be used for such tasks. In this
+file you may find list of unix commands and tasks and their Smalltalk
+equivalents.
+
+Contents:
+
+ File Manipulation
+ Output
+ Paths and filenames
+ Network
+ Math
+ Date and Time
+
+File manipulation
+-----------------
+
+> fm := NSFileManager defaultManager
+
+ls
+
+ > (fm directoryContentsAtPath: '.') sortedArrayUsingSelector:#compare:
+
+pwd
+
+ > fm currentDirectoryPath
+
+cd path
+
+ > fm changeCurrentDirectoryPath: 'path'
+
+ln -s path other
+
+ > fm createSymbolicLinkAtPath:'path' pathContent:'other'
+
+cp src dest
+
+ > fm copyPath:'src' toPath:'dest' handler: nil
+
+cp file_list dest
+
+ > file_list do: [ :file | fm copyPath:file toPath:'dest' handler: nil ]
+
+mv - as cp, movePath:toPath:handler:
+ln - as cp, linkPath:toPath:handler:
+rm - removeFileAtPath:handler:
+
+mkdir dir
+
+ > fm createDirectoryAtPath:'dir' attributes:nil
+
+df path
+
+ > fm fileSystemAttributesAtPath:'path'
+
+Output
+------
+
+echo 'string'
+
+ > Transcript show:'string'
+
+cat file
+
+ > Transcript show: (NSString stringWithContentsOfFile:'file')
+
+"write a string to a file"
+
+ > ('string' writeToFile:'file' atomically:YES)
+
+"create a string from a file"
+
+ > str := NSString stringWithContentsOfFile:'file'
+
+
+Paths and filenames
+--------------------------------
+For more information, refer to the NSString documentation.
+NSString methods for path manipulation:
+
+ - fileSystemRepresentation
+ - isAbsolutePath
+
+ - pathComponents
+ - lastPathComponent
+ - pathExtension
+
+ - stringByAbbreviatingWithTildeInPath
+ - stringByAppendingPathComponent:
+ - stringByAppendingPathExtension:
+ - stringByDeletingLastPathComponent
+ - stringByDeletingPathExtension
+ - stringByExpandingTildeInPath
+ - stringByResolvingSymlinksInPath
+ - stringByStandardizingPath
+ - stringsByAppendingPaths:
+
+Examples:
+
+ > path := '/usr/GNUstep/System/Applications/Ink.app'
+ > path pathComponents
+ (?) GSArray
+ 0 /
+ 1 usr
+ 2 GNUstep
+ 3 System
+ 4 Applications
+ 5 Ink.app
+
+ > path lastPathComponent
+ (?) Ink.app
+
+ > path pathExtension
+ (?) app
+
+In Smalltalk there is a symbolic selector '/' for NSString that is equivalent to
+the 'stringByAppendingPathComponent:'.
+
+ > path := 'somePath'
+ > filename := 'someFilename'
+ > fullPath := path / filename
+
+Network
+-------
+
+localhost
+
+ > NSHost currentHost name
+
+nslookup host_name
+
+ > (NSHost hostWithName:'host_name') addresses
+
+nslookup host_address
+
+ > (NSHost hostWithAddress:'host_address') names
+
+"download a file from the web"
+
+ > data := NSData dataWithContentsOfURL:'url'
+ > data writeToFile:'file' atomically:YES
+
+"read a file from the web"
+
+ > string := NSString stringWithContentsOfURL:'url'
+
+
+Math
+----
+Just like in:
+ > 1 + 1
+or in:
+ > a := b * c
+
+
+Date and Time
+-------------
+
+date
+ > NSDate date
+...or...
+date
+ > NSCalendarDate date
+
+
+For more information read the NSDate and NSCalendarDate documentation
+
+NSCalendarDate methods:
+
+Creating a date
+
+ + calendarDate
+ + dateWithString:calendarFormat:
+ + dateWithString:calendarFormat:locale:
+ + dateWithYear:month:day:hour:minute:second:timeZone:
+
+Retrieving date elements
+
+ - dayOfCommonEra
+ - dayOfMonth
+ - dayOfWeek
+ - dayOfYear
+ - hourOfDay
+ - minuteOfHour
+ - monthOfYear
+ - secondOfMinute
+ - yearOfCommonEra
+
+Adjusting a date
+
+ - dateByAddingYears:months:days:hours:minutes:seconds: