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Qshell
Qshell is an optional command-line interpreter (shell) for the IBM i operating system. Qshell is based on POSIX and X/Open standards. It is a Bourne-like shell that also includes features of KornShell. The utilities (or commands) are external programs that provide additional functions. The development team of Qshell had to deal with platform-specific issues such as translating between ASCII and EBCDIC. The shell supports interactive mode as well as batch processing and can run shell scripts from Unix-like operating systems with few or no modifications. Commands The following is a list of commands that are supported by the Qshell command-line interpreter on IBM i 7.4. Differences from other Unix shells Qshell does not support the redirection operator or provide a command history. It also has no job control support as IBM i operating system does not have the concept of a foreground or background process group. The POSIX standard and built-in commands are therefore not av ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM I
IBM i (the ''i'' standing for ''integrated'') is an operating system developed by IBM for IBM Power Systems. It was originally released in 1988 as OS/400, as the sole operating system of the IBM AS/400 line of systems. It was renamed to i5/OS in 2004, before being renamed a second time to IBM i in 2008. It is an evolution of the System/38 CPF operating system, with compatibility layers for System/36 SSP and AIX applications. It inherits a number of distinctive features from the System/38 platform, including the Machine Interface, the implementation of object-based addressing on top of a single-level store, and the tight integration of a relational database into the operating system. History Origin OS/400 was developed alongside the AS/400 hardware platform beginning in December 1985. Development began in the aftermath of the failure of the Fort Knox project, which left IBM without a competitive midrange system. During the Fort Knox project, a skunkworks project was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chgrp
The (from change group) command may be used by unprivileged users on various operating systems to change the group associated with a file system object (such as a computer file, directory, or link) to one of which they are a member. A file system object has 3 sets of access permissions, one set for the owner, one set for the group and one set for others. Changing the group of an object could be used to change which users can write to a file. History The command was originally developed as part of the Unix operating system by AT&T Bell Laboratories. It is also available in the Plan 9 and Inferno operating systems and in most Unix-like systems. The command has also been ported to the IBM i operating system. Syntax chgrp 'options''''group'' ''FSO'' * The ''group'' parameter specifies the new group with which the files or directories should be associated. It may either be a symbolic name or an identifier. * The ''FSO'' specifies one or more file system objects, which ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirname
dirname is a standard computer program on Unix and Unix-like operating systems. When dirname is given a pathname, it will delete any suffix beginning with the last slash ('/') character and return the result. dirname is described in the Single UNIX Specification and is primarily used in shell scripts. History The version of dirname bundled in GNU coreutils was written by David MacKenzie and Jim Meyering. The command is available as a separate package for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities. The command has also been ported to the IBM i operating system. Usage The Single UNIX Specification for dirname is: dirname string :string ::A pathname Examples dirname will retrieve the directory-path name from a pathname ignoring any trailing slashes $ dirname /home/martin/docs/base.wiki /home/martin/docs $ dirname /home/martin/docs/. /home/martin/docs $ dirname /home/martin/docs/ /home/martin $ dirnam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cut (Unix)
In computing, cut is a command line utility on Unix and Unix-like operating systems which is used to extract sections from each line of input — usually from a file. It is currently part of the GNU coreutils package and the BSD Base System. Extraction of line segments can typically be done by bytes (-b), characters (-c), or fields (-f) separated by a delimiter (-d — the tab character by default). A range must be provided in each case which consists of one of N, N-M, N- (N to the end of the line), or -M (beginning of the line to M), where N and M are counted from 1 (there is no zeroth value). Since version 6, an error is thrown if you include a zeroth value. Prior to this the value was ignored and assumed to be 1. History is part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX.1 and the Single Unix Specification. It first appeared in AT&T System III UNIX in 1982. The version of cut bundled in GNU coreutils was w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compress
compress is a Unix shell compression program based on the LZW compression algorithm. Compared to more modern compression utilities such as gzip and bzip2, compress performs faster and with less memory usage, at the cost of a significantly lower compression ratio. The uncompress utility will restore files to their original state after they have been compressed using the ''compress'' utility. If no files are specified, the standard input will be uncompressed to the standard output. In the upcoming POSIX and Single Unix Specification revision, it is planned that DEFLATE algorithm used in gzip format be supported in those utilities. Description of program Files compressed by ''compress'' are typically given the extension ".Z" (modeled after the earlier pack program which used the extension ".z"). Most ''tar'' programs will pipe their data through ''compress'' when given the command line option "-Z". (The ''tar'' program in its own does not compress; it just stores multi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cmp (Unix)
In computing, cmp is a command-line utility on Unix and Unix-like operating systems that compares two files of any type and writes the results to the standard output. By default, cmp is silent if the files are the same; if they differ, the byte and line number at which the first difference occurred is reported. The command is also available in the OS-9 shell. History is part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX.1 and the Single Unix Specification. It first appeared in Version 1 Unix. The version of cmp bundled in GNU coreutils was written by Torbjorn Granlund and David MacKenzie. The command is available as a separate package for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities. The command has also been ported to the IBM i operating system. Switches cmp may be qualified by the use of command-line switches. The switches supported by notable im ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chown
The command , an abbreviation of ''change owner'', is used on Unix and Unix-like operating systems to change the owner of file system files, directories Directory may refer to: * Directory (computing), or folder, a file system structure in which to store computer files * Directory (OpenVMS command) * Directory service, a software application for organizing information about a computer network's .... Unprivileged (regular) users who wish to change the group membership of a file that they own may use . The ownership of any file in the system may only be altered by a super-user. A user cannot ''give away'' ownership of a file, even when the user owns it. Similarly, only a member of a group can change a file's ''group ID'' to that group. The command is available as a separate package for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities. The command has also been ported to the IBM i operating system. See also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chmod
In Unix and Unix-like operating systems, is the command and system call used to change the access permissions and the special mode flags (the ''setuid'', ''setgid'', and ''sticky'' flags) of file system objects ( files and directories). Collectively these were originally called its modes, and the name was chosen as an abbreviation of ''change mode''. History A command first appeared in AT&T UNIX version 1, along with the system call. As systems grew in number and types of users, access-control lists were added to many file systems in addition to these most basic modes to increase flexibility. The version of bundled in GNU coreutils was written by David MacKenzie and Jim Meyering. The command is available as a separate package for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities. The command has also been ported to the IBM i operating system. Command syntax Throughout this section, ''ser'' refers to the ow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alias (command)
In computing, alias is a command in various command-line interpreters ( shells), which enables a replacement of a word by another string. It is mainly used for abbreviating a system command, or for adding default arguments to a regularly used command. alias is available in Unix shells, AmigaDOS, 4DOS/ 4NT, KolibriOS, Windows PowerShell, ReactOS, and the EFI shell. Aliasing functionality in the MS-DOS and Microsoft Windows operating systems is provided by the DOSKey command-line utility. An alias will last for the life of the shell session. Regularly used aliases can be set from the shell's rc file (such as .bashrc) so that they will be available upon the start of the corresponding shell session. The alias commands may either be written in the config file directly or sourced from a separate file. History In Unix, aliases were introduced in the C shell and survive in descendant shells such as tcsh and bash. C shell aliases were strictly limited to one line. This was usefu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dot (command)
In a Unix shell, the full stop called the dot command (.) is a command that evaluates commands in a computer file in the current execution context. In C Shell, a similar functionality is provided as the source command, and this name is seen in "extended" POSIX shells as well. The dot command is not to be confused with a dot file, which is a dot-prefixed hidden file or hidden directory. Nor is it to be confused with the ./scriptfile notation for running commands, which is simply a relative path pointing to the current directory (notated in Unix as a '.' character, and typically outside of the Path variable). Arguments The filename is the dot command's first argument. When this argument does not contain a slash, the shell will search for the file in all directories defined in the PATH environment variable. Unlike normal commands which are also found in PATH, the file to source does not have to be executable. Otherwise the filename is considered as a simple path to the file. In s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basename
basename is a standard computer program on Unix and Unix-like operating systems. When basename is given a pathname, it will delete any prefix up to the last slash ('/') character and return the result. basename is described in the Single UNIX Specification and is primarily used in shell scripts. History was introduced in X/Open Portability Guidelines issue 2 of 1987. It was inherited into the first version of POSIX and the Single Unix Specification. It first appeared in 4.4BSD. The version of basename bundled in GNU coreutils was written by David MacKenzie. The command is available as a separate package for Microsoft Windows as part of the GnuWin32 project and the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities. Usage The Single UNIX Specification specification for basename is. basename string uffix :string ::A pathname :suffix ::If specified, basename will also delete the suffix. Examples basename will retrieve the last name from a pathna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cp (Unix)
In computing, cp is a command in various Unix and Unix-like operating systems for copying files and directories. The command has three principal modes of operation, expressed by the types of arguments presented to the program for copying a file to another file, one or more files to a directory, or for copying entire directories to another directory. The utility further accepts various command line option flags to detail the operations performed. The two major specifications are POSIX ''cp'' and GNU ''cp''. GNU ''cp'' has many additional options over the POSIX version. The command is also available in the EFI shell. History cp was part of Version 1 Unix. The version of cp bundled in GNU coreutils was written by Torbjorn Granlund, David MacKenzie, and Jim Meyering. Operating modes cp has three principal modes of operation. These modes are inferred from the type and count of arguments presented to the program upon invocation. *When the program has two arguments of path names ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
