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Revision 13309

Added by Aaron Marcuse-Kubitza over 10 years ago

bin/in_place: diff: use --brief to avoid scanning the entire file for large files

View differences:

trunk/bin/in_place
1 1 
#!/bin/sh -e
2 2 
# Runs a stream command on a file
3 
# Usage: [preserve_mtime=1] self file command
3 
# Usage: [preserve_mtime=1] [preserve_mtime=1] self file command
4 4 

  		




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file="$1"


  		




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shift


  		




  ......




  12
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trap onExit EXIT


  		




  13
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"$@" <"$file" >"$temp" # exits on error so file not updated


  		




  15
  
  
    
diff "$file" "$temp" >/dev/null && exit # don't update file if no change


  		




  
  15
  
    
diff --brief "$file" "$temp" >/dev/null && exit # don't update file if no change


  		




  
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	# --brief: avoid scanning the entire file for large files


  		




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if test "$preserve_mtime"; then touch -r "$file" "$temp"; fi


  		




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case "$(uname)" in Linux) chmod --reference="$file" "$temp";; esac


  		




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mv "$temp" "$file"


  		












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