DAVIS, Calif., October 8, 2002 – SoftIntegration, Inc., the leader of
scripting technology for ubiquitous computing, today announced the
release of Ch SDK for Mac OS X. Ch is a superset of C/C++ interpreter
for scripting, plotting and and numeric computing. Ch SDK allows Ch
scripts to interface C/C++ binary modules.
Ch SDK for Mac OS X allows cross platform C/C++ libraries accessed
via C compatible scripts. Ch scripts can access compiled C/C++
libraries such as static library, shared library or Dynamically
Linked Library (DLL). All C/C++ library functions can run in Ch
without modifications. There is no distinction between the
interpreted and compiled code.
The instructions below are tested on Mac OS 10.7.3 (Lion). Open System Preferences Network from Mac applications menu. Click the '+' button to create a new service, then select VPN as the interface type, and choose L2TP over IPsec from the pull-down menu. Latest macOS Sierra/High Sierra-compatible driver for devices using the CH340G, CH34G or CH34X chipset.This chipset is used in several Arduino-compatible clones and serial-to-USB cables. Discover the innovative world of Apple and shop everything iPhone, iPad, Apple Watch, Mac, and Apple TV, plus explore accessories, entertainment, and expert device support.
'Ch is ideal for scripting for C/C++ programmers. It minimizes the
number of programming languages that software developers have to
learn and program,' said Dr. Timefix mac os. Dawn Cheng, General Manager at
SoftIntegration. 'Ch SDK for Mac OS X allows speedy cross-platform
application development and deployment.'
Ch supports ISO C standard, C++ class, POSIX, GTK+, Win32, OpenGL,
X/Motif and socket/WinSock with over 8,000 functions. It is an
interpretive implementation of C as Unix/Windows command shell. Ch
bridges the gap between C and Unix shell. Unix shell commands such as
grep, awk, and sed can run inside Ch shell in the same manner as in
BASH and csh shells. Ch is a C-compatible shell whereas csh is a
C-like shell. Ch can be used in either command shell or program mode
interpretively.
Ch also supports computational arrays and C LAPACK for linear algebra
and matrix computations, 2D/3D plotting and scientific numerical
computing with advanced high-level numerical functions for linear
systems, differential equation solving, integration, non-linear
equations, curve fitting, fast Fourier analysis, etc. For example,
linear equation b = A*x can be written verbatim in Ch.
Ch is an ideal solution for automating repetitive tasks, hardware
testing, rapid application development, and interactive teaching and
Rubber man mac os. student learning.
Ch Standard Edition is free for academic and non-profit
organizations. In addition to Mac OS X, Ch supports Windows, Solaris,
HP-UX, and Linux.
About SoftIntegration, Inc.
SoftIntegration, Inc., founded in 1999, is the leader of scripting
technology for ubiquitous computing. SoftIntegration provides
infrastructure software and services for rapid application
development and deployment, scientific numerical computing, embedded
scripting, and Web-based software integration. Our flagship product
— Ch is an embeddable C/C++ interpreter. It is the solution for
engineers and scientists, Web programmers, software developers, C/C++
beginners and experts, system administrators, real-time programmers,
quality analysts, and instructors and professors.
Contact:
SoftIntegration, Inc. tel (530) 297-7398 fax (530) 297-7392
email: info@softintegration.com
Change access permissions, change mode.
chmod changes the permissions of each given file according to mode, where mode describes the permissions to modify.
Mode can be specified with octal numbers or with letters.
Ch_ Mac Os Download
Ch_ Mac Os Catalina
Using letters is easier to understand for most people. e.g. chmod +x filename.sh to make filename.sh executable.
chmod changes the permissions of each given file according to mode, which can be either an octal number representing the bit pattern for the new permissions or a symbolic representation of changes to make, (+-= rwxXstugoa)
Numeric (absolute) mode:
From one to four octal digits
Any omitted digits are assumed to be leading zeros.
The first digit = selects attributes for the set user ID (4) and set group ID (2) and save text image (1)
The second digit = permissions for the user who owns the file: read (4), write (2), and execute (1)
The third digit = permissions for other users in the file's group: read (4), write (2), and execute (1)
The fourth digit = permissions for other users NOT in the file's group: read (4), write (2), and execute (1)
The octal (0-7) value is calculated by adding up the values for each digit
User (rwx) = 4+2+1 = 7
Group(rx) = 4+1 = 5
World (rx) = 4+1 = 5
chmod mode = 0755
Numeric Mode Examples:
Allow read permission to everyone:
$ chmod 444 file
Allow everyone to read, and execute the file:
$ chmod 755 file
Make a file readable and writable by the group and others:
$ chmod 066 file
Symbolic Mode
The format of a symbolic mode is [who..][[+-=][perm..]..][,..]
Multiple symbolic operations can be given, separated by commas.
who - a combination of the letters `ugoa' controls which users' access to the file will be changed:
u The User who owns it
g other users in the file's Group
o Other users not in the file's group
a All users, this is equivalent to (ugo)
If none of these are given, the effect is as if (a) were given, but bits that are set in the umask are not affected.
+-=
The operator '+' causes the permissions selected to be added to the existing permissions of each file;
'-' causes them to be removed; and '=' causes them to be the only permissions that the file has.
if = is specified with no who then all (owner, group and other) will be cleared.
perm
The letters 'rwxXstugo' select the new permissions for the affected users:
r Read
w Write
x Execute/search (or access for directories)
X Execute/search only if the file is a directory or already has execute permission for some user
s Set user or group ID on execution
t The sticky bit
u User permission
g Group permission
o Other permission (users not in the file's group)
Symbolic Mode Examples:
Deny execute permission to everyone:
$ chmod a-x file
Allow read permission to everyone:
$ chmod a+r file
Make a file readable and writable by the group and others:
$ chmod go+rw file
Make a shell script executable by the user/owner
$ chmod u+x myscript.sh
You can then execute it like this: ./myscript.sh
Allow everyone to read, write, and execute the file and turn on the set group-ID:
$ chmod =rwx,g+s file
ACL - Access Control List manipulation
Each file has one ACL, containing an ordered list of entries. Each entry refers to a user or group, and grants or denies a set of permissions.
Filesystem object permissions:
delete Delete the item. Deletion can be granted by either this permission on an object or the delete_child right on the containing directory.
readattr Read an objects basic attributes. This is implicitly granted if the object can be looked up and not explicitly denied.
writeattr Write an object's basic attributes.
readextattr Read extended attributes.
writeextattr Write extended attributes.
readsecurity Read an object's extended security information (ACL).
writesecurity Write an object's security information (ownership, mode,ACL).
chown Change an object's ownership.
Directory permissions:
list List entries.
search Look up files by name.
add_file Add a file.
add_subdirectory Add a subdirectory.
delete_child Delete a contained object. See the file delete permission above.
Non-directory filesystem object permissions:
read Open for reading.
write Open for writing.
append Open for writing, but in a fashion that only allows writes into areas of the file not previously written.
execute Execute the file as a script or program.
Directory ACL inheritance permissions:
file_inherit Inherit to files.
directory_inherit Inherit to directories.
limit_inherit for subdirectory inheritance; this causes the directory_inherit flag to be cleared, preventing further subdirectories from also inheriting the entry.
only_inherit The entry is inherited by created items but not considered when processing the ACL.
In cases where a user and a group exist with the same name, the user/group name can be prefixed with 'user:' or 'group:' in order to specify the type of name.
ACL Examples
$ chmod +a 'admin allow write' myfile.txt
$ chmod +a 'guest deny read' myfile.txt
$ chmod +a 'admin allow delete' myfile.txt
$ chmod +ai 'others allow read' myfile.txt
$ chmod +a# 2 'others deny read' myfile.txt
$ chmod -a# 1 myfile.txt
$ chmod -a 'admin allow write' myfile.txt
$ chmod =a# 1 'admin allow write,chown'
Clear All ACLs:
$ sudo chmod -RN /path/to/folder
ACL - Access Control List manipulation
Each file has one ACL, containing an ordered list of entries. Each entry refers to a user or group, and grants or denies a set of permissions.
Filesystem object permissions:
delete Delete the item. Deletion can be granted by either this permission on an object or the delete_child right on the containing directory.
readattr Read an objects basic attributes. This is implicitly granted if the object can be looked up and not explicitly denied.
writeattr Write an object's basic attributes.
readextattr Read extended attributes.
writeextattr Write extended attributes.
readsecurity Read an object's extended security information (ACL).
writesecurity Write an object's security information (ownership, mode,ACL).
chown Change an object's ownership.
Directory permissions:
list List entries.
search Look up files by name.
add_file Add a file.
add_subdirectory Add a subdirectory.
delete_child Delete a contained object. See the file delete permission above.
Non-directory filesystem object permissions:
read Open for reading.
write Open for writing.
append Open for writing, but in a fashion that only allows writes into areas of the file not previously written.
execute Execute the file as a script or program.
Directory ACL inheritance permissions:
file_inherit Inherit to files.
directory_inherit Inherit to directories.
limit_inherit for subdirectory inheritance; this causes the directory_inherit flag to be cleared, preventing further subdirectories from also inheriting the entry.
only_inherit The entry is inherited by created items but not considered when processing the ACL.
In cases where a user and a group exist with the same name, the user/group name can be prefixed with 'user:' or 'group:' in order to specify the type of name.
ACL Examples
$ chmod +a 'admin allow write' myfile.txt
$ chmod +a 'guest deny read' myfile.txt
$ chmod +a 'admin allow delete' myfile.txt
$ chmod +ai 'others allow read' myfile.txt
$ chmod +a# 2 'others deny read' myfile.txt
$ chmod -a# 1 myfile.txt
$ chmod -a 'admin allow write' myfile.txt
$ chmod =a# 1 'admin allow write,chown'
Clear All ACLs:
$ sudo chmod -RN /path/to/folder
Disable Apple Remote Desktop by Revoking execute rights:
$ cd /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/
$ sudo ls -l
$ sudo chmod u-s ARDAgent
Only the owner of a file or the super-user is permitted to change the mode of a file.
The return status is zero if the mode is successfully changed, non-zero otherwise.
When chmod is applied to a directory:
read = list files in the directory
write = add new files to the directory
execute = access files in the directory
chmod never changes the permissions of symbolic links. This is not a problem since the permissions of symbolic links are never used. However, for each symbolic link listed on the command line, chmod changes the permissions of the pointed-to file. In contrast, chmod ignores symbolic links encountered during recursive directory traversals.
'It's easier to ask forgiveness than it is to get permission' ~ Rear Admiral Grace Hopper
Related macOS comands:
chown - Change file owner and group.
chflags - Change a file or folder's flags.
install - Copy files and set attributes.
mount - Mount a file system.
sharing - Create share points for afp, ftp and smb services.
stat - Display file or file system status.
umask - Users file creation mask.
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