1!:0 y |
Directory. y is a string of the path
search expression (a boxed string is also accepted);
the result is a 5-column table of the file name,
modification time, size, permission, and attributes,
individually boxed. For example, try 1!:0 '*.*'.
The permission and attribute columns are system dependent.
For example, in Windows:
1!:0 'j.exe'
+-----+-----------------+------+---+------+
|j.exe|1998 2 2 14 33 46|676864|rwx|-----a|
+-----+-----------------+------+---+------+
Permission is a 3-letter string indicating the read, write,
and execute permissions. Attributes is a 6-letter string
indicating read-only, hidden, system, volume label, directory, and archive.
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1!:1 y
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Read. y is a file name or a file number
(produced by 1!:21); the result is a string of the file contents.,
e.g. 1!:1 <'abc.q'. The following values
for y are also permitted:
1 read from the keyboard (does not work within a script)
3 (Unix only) read from standard input (stdin)
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x 1!:2 y |
Write. x is a string of the new contents
of the file; y is a file name or file number
(produced by 1!:21). The following values
for y are also permitted:
2 screen output.
4 (Unix only) standard output (stdout)
5 (Unix only) standard error (stderr)
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x 1!:3 y |
Append. Like x 1!:2 y, but appends
rather than replaces
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1!:4 y |
Size
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1!:5 y |
Create Directory. y is a (boxed) directory name
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[x] 1!:6 y |
Query/Set Attributes.
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[x] 1!:7 y |
Query/Set Permissions.
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1!:11 y |
Indexed Read. y is a list of a boxed file name
(or number) and a boxed index and length. The index may be negative.
If the length is elided, the read goes to the end. For example:
1!:11 'abc.x';1000 20
f=: 1!:21 <'abc.x'
1!:11 f,1000 20
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x 1!:12 y |
Indexed Write. x is the
string to be written; y is a list of a boxed file name
(or number) and a boxed index.
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1!:20 y |
File Numbers and Names. A 2-column table of the open file
numbers and names.
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1!:21 y |
Open. Open file named y, creating it
if necessary; result is a file number.
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1!:22 y |
Close. Close file named or numbered y.
Any locks are released.
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1!:30 y |
Locks. A 3-column integer table of the file number,
index, and length of file locks. The argument y is
required but ignored.
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1!:31 y |
Lock. y is a 3-element integer vector of the
file number, index, and length of the file region to be locked;
the result is 1 if the request succeeded, and 0 if it did not.
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1!:32 y |
Unlock. y is a 3-element integer vector of the
file number, index, and length of the file region to be unlocked.
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1!:43 y |
Query Current Working Directory. Query the current working directory (Posix getcwd).
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1!:44 y |
Set Current Working Directory. Set the current working directory (Posix chdir).
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1!:45 y |
Profile. The default profile.
In Windows, 1!:45 returns profile.ijs in the path of the
J Front End (j.exe or jconsole.exe).
For example: c:\j501a\profile.ijs .
In Unix, 1!:45 uses environment variables and
the J version to determine the default profile:
- The version is the text in 9!:14 '' up to the first / .
If 9!:14 '' returned j501a/2002-07-05/17:50 ,
then the version is j501a .
- If HOME/version/profile.ijs exists, then it is the default profile.
For example, if HOME was /home/eric ,
then /home/eric/j501a/profile.ijs would be
the default profile if it existed.
- If that file doesn't exist, environment
variable JPATHversion (for example, JPATHj501a),
if it is defined, is the default profile.
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1!:55 y |
Erase File/Directory. e.g., 1!:55<'careful'
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