Appends a backup suffix to the pathname
Appends a backup suffix to the pathname and, optionally, renames an existing file accordingly.
In combination with popBackupFile(), this method is useful
for creating a backup of a file and restoring it.
## Default S3 method:
pushBackupFile(filename, path=NULL, suffix=".bak", isFile=TRUE,
onMissing=c("ignore", "error"), copy=FALSE, overwrite=TRUE, ..., verbose=FALSE)filename |
The filename of the file to backup. |
path |
The path of the file. |
suffix |
The suffix to be appended. |
isFile |
If |
onMissing |
A |
copy |
If |
overwrite |
If |
... |
Not used. |
verbose |
Returns the pathname with the suffix appended.
Henrik Bengtsson
# Create a file pathname <- file.path(tempdir(), "foobar.txt") cat(file=pathname, "File v1\n") # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - # (a) Backup and restore a file # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - # Turn it into a backup file pathnameB <- pushBackupFile(pathname, verbose=TRUE) print(pathnameB) # Restore main file from backup pathnameR <- popBackupFile(pathnameB, verbose=TRUE) print(pathnameR) # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - # (b) Backup, create a new file and frop backup file # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - # Turn it into a backup file pathnameB <- pushBackupFile(pathname, verbose=TRUE) print(pathnameB) # Create a new file cat(file=pathname, "File v2\n") # Drop backup because a new main file was successfully created pathnameR <- popBackupFile(pathnameB, verbose=TRUE) print(pathnameR)
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