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% File src/library/base/man/Sys.which.Rd
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% File src/library/base/man/Sys.which.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 2007-2014 R Core Team
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% Copyright 2007-2017 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{Sys.which}
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\name{Sys.which}
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\alias{Sys.which}
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\alias{Sys.which}
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\title{Find Full Paths to Executables}
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\title{Find Full Paths to Executables}
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A character vector of the same length as \code{names}, named by
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A character vector of the same length as \code{names}, named by
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\code{names}. The elements are either the full path to the
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\code{names}. The elements are either the full path to the
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executable or some indication that no executable of that name was
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executable or some indication that no executable of that name was
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found. Typically the indication is \code{""}, but this does depend on
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found. Typically the indication is \code{""}, but this does depend on
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the OS (and the known exceptions are changed to \code{""}). Missing
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the OS (and the known exceptions are changed to \code{""}). Missing
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values in \code{names} have missing return values (as from \R 3.0.0).
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values in \code{names} have missing return values.
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On Windows the paths will be short paths (8+3 components, no spaces)
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On Windows the paths will be short paths (8+3 components, no spaces)
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with \code{\\} as the path delimiter.
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with \code{\\} as the path delimiter.
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}
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}
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\note{
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\note{
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Except on Windows this calls the system command \command{which}: since
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Except on Windows this calls the system command \command{which}: since
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that is not part of e.g.\sspace{}the POSIX standards, exactly what it does is
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that is not part of e.g.\sspace{}the POSIX standards, exactly what it does is
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OS-dependent. It will usually do tilde-expansion and it may make use
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OS-dependent. It will usually do tilde-expansion and it may make use
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of \command{csh} aliases.
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of \command{csh} aliases.
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In \R 2.x.y, arguments containing spaces or other metacharacters
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needed to be escaped as they would be for a shell: for example Windows
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paths containing spaces needed to be enclosed in double quotes.
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}
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}
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\examples{
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\examples{
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## the first two are likely to exist everywhere
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## the first two are likely to exist everywhere
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## texi2dvi exists on most Unix-alikes and under MiKTeX
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## texi2dvi exists on most Unix-alikes and under MiKTeX
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Sys.which(c("ftp", "ping", "texi2dvi", "this-does-not-exist"))
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Sys.which(c("ftp", "ping", "texi2dvi", "this-does-not-exist"))
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