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Full Discussion: sed replacement inplace
Top Forums UNIX for Dummies Questions & Answers sed replacement inplace Post 302964377 by Don Cragun on Thursday 14th of January 2016 03:25:30 AM
Old 01-14-2016
Quote:
Originally Posted by anbu23
Redirect sed output to a temp file and rename it to source file like

Code:
sed ... sourceFile > tempFile
mv tempFile sourceFile

If the sed command fails, the above suggestion will destroy the input file.
Code:
sed ... sourcefile > tmpfile && cp tmpfile sourcefile && rm -f tmpfile

will only replace sourcefile if the sed succeeded and it will preserve permissions and links to sourcefile (which might not be important unless there are multiple hard links to sourcefile or the permissions on sourcefile are different from what will be set with your current umask setting).

Last edited by Don Cragun; 01-14-2016 at 04:56 AM.. Reason: Fix typo: s/your what/what/
These 2 Users Gave Thanks to Don Cragun For This Post:
 

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PSORDER(1)						      General Commands Manual							PSORDER(1)

NAME
psorder - PostScript pageorder filter SYNOPSIS
psorder [ -duf ] sourcefile DESCRIPTION
psorder is a filter that re-orders the pages of a PostScript document. The result is written to the standard output. By default, docu- ments are processed into ascending order (the lowest numbered page is printed first). Some PostScript documents specify that the order of their pages should never be changed; the default action of psorder is to follow this specification. If no source file is given, or if sourcefile is `-', psorder reads from the standard input file. OPTIONS
-d Re-order the pages of the document in downward or descending order. This is typically used to change the order of a document to be printed by a printer that stacks pages face-up, such as an Apple LaserWriter or LaserWriter Plus. -u Specifies forward order, and is the default. It is used to try and ensure the correct ordering when a document will be printed by a printer that stacks the pages face-down. -f Force psorder to re-order the pages, even if the document claims that its page order is not to be trifled with. This option should only be used experimentally, as it may cause documents to print incorrectly. SEE ALSO
psf(8), lpr(1). netatalk 1.2 17 Dec 1991 PSORDER(1)
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