diff options
Diffstat (limited to 'doc/exec.n')
| -rw-r--r-- | doc/exec.n | 31 |
1 files changed, 21 insertions, 10 deletions
@@ -6,7 +6,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: exec.n,v 1.23 2007/12/13 15:22:32 dgp Exp $ +'\" RCS: @(#) $Id: exec.n,v 1.24 2008/06/29 22:28:24 dkf Exp $ '\" .so man.macros .TH exec n 8.5 Tcl "Tcl Built-In Commands" @@ -17,7 +17,6 @@ exec \- Invoke subprocesses .SH SYNOPSIS \fBexec \fR?\fIswitches\fR? \fIarg \fR?\fIarg ...\fR? .BE - .SH DESCRIPTION .PP This command treats its arguments as the specification @@ -32,16 +31,17 @@ of the pipeline specification. The following switches are currently supported: .TP 13 \fB\-ignorestderr\fR -.VS 8.5 +. Stops the \fBexec\fR command from treating the output of messages to the pipeline's standard error channel as an error case. -.VE 8.5 .TP 13 \fB\-keepnewline\fR +. Retains a trailing newline in the pipeline's output. Normally a trailing newline will be deleted. .TP 13 \fB\-\|\-\fR +. Marks the end of switches. The argument following this one will be treated as the first \fIarg\fR even if it starts with a \fB\-\fR. .PP @@ -57,64 +57,77 @@ or in the same argument with no intervening space (i.e. .QW \fB<\fIfileName\fR ). .TP 15 \fB|\fR +. Separates distinct commands in the pipeline. The standard output of the preceding command will be piped into the standard input of the next command. .TP 15 \fB|&\fR +. Separates distinct commands in the pipeline. Both standard output and standard error of the preceding command will be piped into the standard input of the next command. This form of redirection overrides forms such as 2> and >&. .TP 15 \fB<\0\fIfileName\fR +. The file named by \fIfileName\fR is opened and used as the standard input for the first command in the pipeline. .TP 15 \fB<@\0\fIfileId\fR +. \fIFileId\fR must be the identifier for an open file, such as the return value from a previous call to \fBopen\fR. It is used as the standard input for the first command in the pipeline. \fIFileId\fR must have been opened for reading. .TP 15 \fB<<\0\fIvalue\fR +. \fIValue\fR is passed to the first command as its standard input. .TP 15 \fB>\0\fIfileName\fR +. Standard output from the last command is redirected to the file named \fIfileName\fR, overwriting its previous contents. .TP 15 \fB2>\0\fIfileName\fR +. Standard error from all commands in the pipeline is redirected to the file named \fIfileName\fR, overwriting its previous contents. .TP 15 \fB>&\0\fIfileName\fR +. Both standard output from the last command and standard error from all commands are redirected to the file named \fIfileName\fR, overwriting its previous contents. .TP 15 \fB>>\0\fIfileName\fR +. Standard output from the last command is redirected to the file named \fIfileName\fR, appending to it rather than overwriting it. .TP 15 \fB2>>\0\fIfileName\fR +. Standard error from all commands in the pipeline is redirected to the file named \fIfileName\fR, appending to it rather than overwriting it. .TP 15 \fB>>&\0\fIfileName\fR +. Both standard output from the last command and standard error from all commands are redirected to the file named \fIfileName\fR, appending to it rather than overwriting it. .TP 15 \fB>@\0\fIfileId\fR +. \fIFileId\fR must be the identifier for an open file, such as the return value from a previous call to \fBopen\fR. Standard output from the last command is redirected to \fIfileId\fR's file, which must have been opened for writing. .TP 15 \fB2>@\0\fIfileId\fR +. \fIFileId\fR must be the identifier for an open file, such as the return value from a previous call to \fBopen\fR. Standard error from all commands in the pipeline is @@ -122,11 +135,13 @@ redirected to \fIfileId\fR's file. The file must have been opened for writing. .TP 15 \fB2>@1\0\fR +. Standard error from all commands in the pipeline is redirected to the command result. This operator is only valid at the end of the command pipeline. .TP 15 \fB>&@\0\fIfileId\fR +. \fIFileId\fR must be the identifier for an open file, such as the return value from a previous call to \fBopen\fR. Both standard output from the last command and standard error from @@ -135,12 +150,9 @@ The file must have been opened for writing. .PP If standard output has not been redirected then the \fBexec\fR command returns the standard output from the last command -in the pipeline, -.VS 8.5 -unless +in the pipeline, unless .QW 2>@1 was specified, in which case standard error is included as well. -.VE 8.5 If any of the commands in the pipeline exit abnormally or are killed or suspended, then \fBexec\fR will return an error and the error message will include the pipeline's output followed by @@ -149,9 +161,7 @@ error messages describing the abnormal terminations; the about the last abnormal termination encountered. If any of the commands writes to its standard error file and that standard error is not redirected -.VS 8.5 and \fB\-ignorestderr\fR is not specified, -.VE 8.5 then \fBexec\fR will return an error; the error message will include the pipeline's standard output, followed by messages about abnormal terminations (if any), followed by the standard error @@ -353,6 +363,7 @@ console window is not available to them. .RE .TP \fBUnix\fR\0\0\0\0\0\0\0 +. The \fBexec\fR command is fully functional and works as described. .SH "UNIX EXAMPLES" Here are some examples of the use of the \fBexec\fR command on Unix. |