|
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 ... [...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 IBM System/38, System/38 Control Program Facility, CPF operating system, with compatibility layers for IBM System/36, System/36 System Support Program, SSP and IBM AIX, AIX applications. It inherits a number of distinctive features from the System/38 platform, including the System/38#Machine Interface, Machine Interface which provides hardware independence, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Attr
In computing, ATTRIB is a command in Intel ISIS-II, DOS, IBM OS/2, Microsoft Windows and ReactOS that allows the user to change various characteristics, or "attributes" of a computer file or directory. The command is also available in the EFI shell. History Several operating systems provided a set of modifiable file characteristics that could be accessed and changed through a low-level system call. For example, as of release MS-DOS 4.0, the first six bits of the file attribute byte indicated whether or not a file was read-only (as opposed to writeable), hidden, a system file, a volume label, a subdirectory, or if the file had been "archived" (with the bit being set if the file had changed since the last use of the BACKUP command). However, initial releases of the operating system did not provide user-level method for reading or changing these values. The initial version of the ATTRIB command for DOS was first included in version 3.0 of PC DOS, with functionality limited to cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirname
dirname is a shell command for extracting the directory path portion of a path; without the last name. The command is specified in the Single UNIX Specification and is primarily used in shell scripts. The version in GNU Core Utilities was written by David MacKenzie and Jim Meyering. The command is available for Windows via UnxUtils, and is in IBM i. Usage The Single UNIX Specification is: . Examples The command reports the directory path portion of a path ignoring any trailing slashes. $ dirname /home/martin/docs/base.wiki /home/martin/docs $ dirname /home/martin/docs/ /home/martin $ dirname base.wiki . Performance Since the command accepts only one operand, its usage within the inner loop In computer programs, an important form of control flow is the Loop (computing), loop which causes a block of code to be executed more than once. A common idiom is to have a loop Nested loop, nested inside another loop, with the contained loop be ... of a shell script can be de ... [...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 The original Bell Labs version was written by Gottfried W. R. Luderer. 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 Syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cp (Unix)
cp is a shell command for copying files and directories. If the user has write access to a target file, the command copies the content by opening it in update mode. This preserves the file's inode instead of creating a new file with default permissions. The command was part of Version 1 Unix, and is specified by POSIX. The implementation from GNU has many additional options beyond the POSIX specification. The command is bundled in GNU Core Utilities and is available in the EFI shell. Options *-f (force) – specifies removal of each target file if it cannot be opened for write operations; removal precedes any copying * -H (dereference) – follows symbolic link In computing, a symbolic link (also symlink or soft link) is a file whose purpose is to point to a file or directory (called the "target") by specifying a path thereto. Symbolic links are supported by POSIX and by most Unix-like operating syste ...s so that the destination has the target file rather ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compress
compress is a Unix shell compression program based on the LZW compression algorithm. Compared to gzip's fastest setting, compress is slightly slower at compression, slightly faster at decompression, and has a significantly lower compression ratio. 1.8 MiB of memory is used to compress the Hutter Prize data, slightly more than gzip's slowest setting. 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. Description 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 multiple files within one tape archive.) Files can be returned to their original ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Command (Unix)
command is a shell command for Unix and Unix-like operating systems. It is used to execute a command whilst suppressing normal shell function lookup. It is specified in the POSIX standard and is often implemented in Unix shells as a shell builtin function. Built-in functions take precedence over programs when resolving the name of a command. A user may suppress the lookup of built-in functions in order to execute a program with the same name as a built-in function. The arguments passed specify the name of the command to be executed, along with its arguments. If the specified command name is the name of a shell built-in function, the command will be processed as if such function did not exist. In all other circumstances the command will be processed as normal. Examples In the following, the ls command is run without any shell functions or aliases that may exist with the same name: $ command ls See also *List of Unix commands This is a list of the shell commands of the ... [...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 may be qualified by the use of command-line switches. The switches supported by notable impleme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chown
, short for change owner, is a shell command for changing the owning user of Unix-based file system files including special files such as directories. The ownership of a file may only be altered by a super-user (such as via sudo). A regular user cannot ''give away'' their ownership of a file. The version of chown bundled in GNU coreutils was written by David MacKenzie and Jim Meyering. The command is available for Windows Windows is a Product lining, product line of Proprietary software, proprietary graphical user interface, graphical operating systems developed and marketed by Microsoft. It is grouped into families and subfamilies that cater to particular sec ... via UnxUtils. The command was ported to IBM i. See also * * * * References https://en.m.wikipedia.org/wiki/Chown# External links * chown manual pageby The Linux Information Project (LINFO) {{Core Utilities commands Operating system security Standard Unix programs Unix SUS2008 utilit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chmod
is a shell command for changing access permissions and special mode flags of files (including special files such as directories). The name is short for ''change mode'' where ''mode'' refers to the permissions and flags collectively. The command originated in AT&T Unix version 1 and was exclusive to Unix and Unix-like operating systems until it was ported to other operating systems such as Windows (in UnxUtils) and IBM i. In Unix and Unix-like operating systems, a system call with the same name as the command, , provides access to the underlying access control data. The command exposes the capabilities of the system call to a shell user. As the need for enhanced file-system permissions grew, access-control lists were added to many file systems to augment the modes controlled via . The implementation of bundled in GNU coreutils was written by David MacKenzie and Jim Meyering. Use Although the syntax of the command varies somewhat by implementation, it generally acc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chgrp
, short for change group, is a shell command for changing the group associated with a Unix-based file system file including special files such as directories. Changing the group of a file is restricted to a super-user (such as via ) or to the file's owning user if the user is in the specified group. A file has access permissions for the owning user, a group and for others. Changing the group for a file changes access to it based on users' group memberships. History The command was originally developed as part of the Unix operating system by AT&T Bell Laboratories. It is available in most Unix-like systems, Plan 9, Inferno and IBM i. The version of chgrp bundled in GNU coreutils was written by David MacKenzie. Use Generally, the syntax can be described as: chgrp 'options''''group'' ''files'' * ''group'' specifies the group with which the files should be associated; may be either a symbolic name or an identifier An identifier is a name that identifies (that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cd (command)
is a shell command that changes the working directory. It is available in many shells and other applications that maintain a working directory. In some contexts, the command can perform actions other than change directory. Some environments provide the change directory feature via a different command name such as . Implementations Generally, a computer system that provides access to a hierarchical file system, provides a change directory command to set the working directory. As this applies to most operating system shells, most support a change directory command, including Unix and Unix-like (i.e. Linux) shells, and Microsoft shells including Command Prompt and PowerShell. Other operating systems with shells supporting the command include OS/2, TRIPOS, AmigaOS (where the command is implied for an input path), ReactOS, DOSBox, and UEFI. * On MS-DOS, the command is available in version 2 and later * DR DOS 6.0 includes the command as both and * On HP MPE/iX the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
