Check that file exists: Difference between revisions
→{{header|langur}}
imported>J7M (add SmallBASIC example) |
Langurmonkey (talk | contribs) |
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[[io]]::fp.existsFile($dir2)
[[io]]::fp.closeFile($dir2)
</syntaxhighlight>
=={{header|langur}}==
The prop() function returns a hash of file/directory properties.
<syntaxhighlight lang="langur">val .printresult = impure fn(.file) {
write .file, ": "
if val .p = prop(.file) {
if .p'isdir {
writeln "is directory"
} else {
writeln "is file"
}
} else {
writeln "nothing"
}
}
.printresult("input.txt")
.printresult("/input.txt")
.printresult("docs")
.printresult("/docs")
</syntaxhighlight>
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0
</syntaxhighlight>
=={{header|RPL}}==
The 2 functions below take a word as an argument and return a boolean stating the presence or not of a 'file' (a 'variable' in RPL jargon) or a directory corresponding to the word.
« VARS SWAP POS
» '<span style="color:blue">ISHERE?</span>' STO
« PATH HOME
VARS ROT POS
SWAP EVAL <span style="color:grey">@ Back to initial directory</span>
» '<span style="color:blue">ISHOME?</span>' STO
=={{header|Ruby}}==
<code>File.exist?</code> only checks if a file exists; it can be a regular file, a directory, or something else. <code>File.file?</code> or <code>File.directory?</code> checks for a regular file or a directory. Ruby also allows <code>FileTest.file?</code> or <code>FileTest.directory?</code>.
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Since in Linux an ''empty'' directory has a size of 4K bytes, we check the number of files it contains to confirm that it's empty.
<syntaxhighlight lang="
for (name in ["input.txt", "`Abdu'l-Bahá.txt"]) {
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docs directory exists and contains 0 files.
</pre>
=={{header|XPL0}}==
Attempting to open a non-existent file or directory will cause an error.
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