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test in Ruby |
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test(cmd, file [, file])
Does a file test. the cmd would be one of following: commands which takes one operand: ?r File is readable by effective uid/gid. ?w File is writable by effective uid/gid. ?x File is executable by effective uid/gid. ?o File is owned by effective uid. ?R File is readable by real uid/gid. ?W File is writable by real uid/gid. ?X File is executable by real uid/gid. ?O File is owned by real uid. ?e File exists. ?z File has zero size. ?s File has non-zero size (returns size). ?f File is a plain file. ?d File is a directory. ?l File is a symbolic link. ?p File is a named pipe (FIFO). ?S File is a socket. ?b File is a block special file. ?c File is a character special file. ?u File has setuid bit set. ?g File has setgid bit set. ?k File has sticky bit set. ?M File last modify time. ?A File last access time ?C File last status change time. commands which takes two operands: ?= Both files have same modify time. ?> File1 is newer than file2. ?< File1 is older than file2. ?- File1 is a hard link to file2 Add by Pancho You can edit it here |
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| Study Reveals a Secret to the Success of Notorious, Disease-Causing Microbes
A study published in the July 23 issue of Cell identifies the mechanism used by several types of common, virulent microbes to infect plants and cause devastating blights. Microbes using this infection mechanism include fungi that are currently causing wheat rust epidemics in Africa and Asia, and a class of parasitic algae, called oomycetes, that resulted in the Irish potato blight of the 19th Century. These microbes remain an agricultural scourge today. The researchers ...
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