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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:
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