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 |
