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Splitting Output Only When Necessary in bash
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Splitting Output Only When Necessary in bash

InfinityCoder April 4, 2017

You want to split output only if the input exceeds your limit, but the split command always creates at least one new file.

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# cookbook filename: func_split
 
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# Output fixed-size pieces of input ONLY if the limit is exceeded
# Called like: Split <file> <prefix> <limit option> <limit argument>
# e.g. Split $output ${output}_ --lines 100
# See split(1) and wc(1) for option details
function Split {
   local file=$1
   local prefix=$2
   local limit_type=$3
   local limit_size=$4
   local wc_option
 
   # Sanity Checks
   if [ -z "$file" ]; then
      printf "%b" "Split: requires a file name!\n"
      return 1
   fi
   if [ -z "$prefix" ]; then
      printf "%b" "Split: requires an output file prefix!\n"
      return 1
   fi
   if [ -z "$limit_type" ]; then
      printf "%b" "Split: requires a limit option (e.g. --lines), see 'man split'!\
n"
      return 1
   fi
   if [ -z "$limit_size" ]; then
      printf "%b" "Split: requires a limit size (e.g. 100), see 'man split'!\n"
      return 1
   fi
 
   # Convert split options to wc options. Sigh.
   # Not all options supported by all wc/split on all systems
   case $limit_type in
        -b|--bytes)      wc_option='-c';;
        -C|--line-bytes) wc_option='-L';;
        -l|--lines)      wc_option='-l';;
   esac
 
   # If whatever limit is exceeded
   if [ "$(wc $wc_option $file | awk '{print $1}')" -gt $limit_size ]; then
 
      # actually do something
      split --verbose $limit_type $limit_size $file $prefix
   fi
} # end of function Split

 

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