qualiu@mypc /cygdrive/c/Users/qualiu
$ ~/tool/nin.cygwin
Get difference-set(not-in-latter) for first file/pipe; Or intersection-set with latter file/pipe. by LQM:
  -u [ --unique ]              Get unique results, discard self/mutual duplicate lines/keys (key = captured groups[1] if set 1~2 Regex patterns).
  -m [ --intersection ]        Get mutual lines/keys intersection in 2 files or file-with-pipe (default is exclusive: 'not-in-latter').
  -i [ --ignore-case ]         Ignore case for plain text matching and Regex matching.
  -n [ --out-not-captured ]    Also output not-captured keys/lines of Regex pattern in first file/pipe.
  -p [ --percentage ]          Output percentages of keys/lines at each line head, and sort by percentages.
  -w [ --out-whole-line ]      Output matched lines other than keys (key = captured groups[1] of Regex pattern).
  -a [ --ascending ]           Ascending sort output by lines or captured-keys or percentages.
  -d [ --descending ]          Descending sort output by lines or captured-keys or percentages.
  -k [ --stop-at-count ] arg   Stop if the matched count of a key/line > [N] when ascending output, or if count < [N] when descending output.
  -K [ --stop-percentage ] arg Stop if the percentage of a key/line > [P%] when ascending output, or if percentage < [P%] when descending output.
  -A [ --no-any-info ]         Not output any info, no warnings no summary (if no errors), only pure result (Please always use -PAC or -PC).
  -I [ --info-normal-out ]     Output summary info to stdout (default is to stderr).
  -M [ --no-summary ]          Not output summary info.
  -O [ --out-not-0-sum ]       Output summary only if the results count is not 0.
  -C [ --no-color ]            No color for output (it's better to not add color if have subsequent matching or processing).
  --colors arg                 Set fore_back colors for -t/-e/-x;d/f/p;m/u like: 'Red' or 't=Red,x=Yellow,e=Green' or 't = red + Yellow_Blue, x = Cyan'.                           
  --keep-color                 Keep color of output result for Windows/MinGW - to be uniform color style with Cygwin/Linux/MacOS.
  --unix-slash arg             Set 1 to output uniform forward slash '/' on Windows + MinGW + Cygwin, like 'c:/' instead of '/c/' or '/cygdrive/c/'.
  --to-stderr                  Output result to stderr. Default: result -> stdout, error/warn/info/verbose -> stderr.
  -P [ --no-percent ]          Not output percentages (Overwrite --percentage).
  --sum                        Sum accumulative counts and percentages(if used -p) for each key/line.
  --not-warn-bom               Not output BOM warnings when reading BOM files which BOM header bytes != 0xEFBBBF.
  -H [ --head ] arg            Output top [N] rows of whole output if N > 0; Skip top [N] lines if N < 0; [N] = 0 means not output.
  -T [ --tail ] arg            Output bottom [N] rows of whole output if N > 0; Skip bottom [N] lines if N < 0; [N] = 0 means not output.
  -J [ --jump-out ]            Jump out (stop and exit) if has set -H [N] and already has output [N] lines.
  --timeout arg                Maximum waiting seconds to stop and exit. No limit if value <= 0. Default = 0.000 s.
  -S [ --switch-first ]        Switch positions (first/latter roles) of 2 files or file/pipe (also will switch their Regex patterns).
  -Z [ --skip-last-empty ]     Skip last empty line in first/latter file.
  -x [ --has-text ] arg        Line must contain this normal/plain text (Can use meanwhile: -t, -x, --nt, --nx).
  --nx arg                     Line must not contain normal/plain text: Exclude/Skip rows.
  -t [ --text-match ] arg      Regex pattern for line text must match (Can use meanwhile: -t, -x, --nt, --nx). Use -t value to filter even if used -e.
  --nt arg                     Regex pattern for lines must not match: Exclude/Skip rows.
  -e [ --enhance ] arg         Regex pattern to color output, inferior to: -t -x. Use merged Regex value of "(-t)|-e" to enhance if used both -t and -e.
  -Y [ --not-from-pipe ]       Force reading from files other than pipe (to avoid reading pipe if running in another command).
  -c [ --show-command ]        Show command line, you can append text for debug, or extraction after -c (if append text, -c and text must be last).
  --exit arg                   Change return value, format: [Number] or [Regex-or-Math]-to-[Exit-Code], like: '1' or '-?\d+-to-1' or 'lt0-to-1,255-to-1'.
  --verbose                    Show parsed arguments, return value, time zone, BOM rows and EXE path, etc.
  -h [ --help ]                See usage and examples below. More detail: https://github.com/qualiu/msr

Usage: nin  File1-or-pipe  File2-or-/dev/null  [Regex-capture1-pattern-1]  [Regex-capture1-pattern-2]  [Options like: -i -u -m -w -H 2 -t xxx --nt xxx]
All [Quoted Args Options] above are Optional, can be omitted.
If has set [Regex-capture1-pattern-N], Must have Regex capture group[1]: Simple examples like: "^(.+)$" or "(.+)" or "^(\S+)" or "^([^\t]+)" or "^(\w+)" etc.
If only set [Regex-capture1-pattern-1] then [Regex-capture1-pattern-2] will use the same.
If both of them not set, will use normal whole line text comparison: check lines in file1/pipe which not-in/in file2.
Example-1: /home/qualiu/tool/nin.cygwin daily-sample.txt  selected-queries.txt   "^([^\t]+)"  "query = (.+)$"   -u -i
Example-2: nin daily-sample.txt /dev/null -p -i
Example-3: cat daily-sample.txt | nin /dev/null -pi
Example-1 uses regex capture1 to get new queries: only in daily-sample.txt but not in the latter file (if use -m will get intersection set of the 2 files).
Example-2/3 are same: get unique(-u) lines in file and show each percentage(-p) with order.

Return value/Exit code($?) = matched line/key count in {first file/pipe} or {mutual intersection}.
But if return value = 0 and caught errors, will exit with return value = -1 (probably 255 on Linux/MacOS or 127 on MinGW which changed by shells like bash).
All error messages will be output to stderr. You can redirect them to stdout by appending 2>&1 to your command line.

Useful options: -H 20 -J, -H 0, -T 3, -k 30, -K 33.33, -T -1, -M, -S, -PAC, -i -u, -iuw, -iuwa, -ip, -ipa, -ipdw, -ium, iumw, -iwn, -im, -imw, -ipdPAC
-m -u : Get unique mutual intersection.
-p -d : Get top distributions/percentages and sort by count/percentages with descending order.
-w -n : Skip lines/keys both matched in latter + first files/pipe, output other keys' lines + non-matched lines (like description/comments) in first.

nin treats Windows nul as same as /dev/null on MinGW / Cygwin / Linux / MacOS.
One important feature: nin does not change the original line order even if used unique(-u) if no sorting of -p/-d/-a/etc.

Frequent use cases as Quick-Start: Use -PAC or -PC to get pure output result.
nin my.txt nul -u -i :     output unique lines in my.txt ignore case.
cat my.txt | nin nul -ui : output unique lines in my.txt ignore case.
nin my.txt nul "^(\w+)" -u -i :  output unique keys (captured words at each line begin) in my.txt ignore case.
nin my.txt nul "^(\w+)" -u -wi : output unique lines (lines of the captured keys) in my.txt ignore case.
nin my.txt other.txt "(my-capture1)" "(other-capture1)" -u :    output captured keys in my.txt not in other.txt.
nin my.txt other.txt "(my-capture1)" "(other-capture1)" -u -S : output captured keys in other.txt not in my.txt.
nin my.txt other.txt "(my-capture1)" "(other-capture1)" -u -m : output mutual keys in other.txt and my.txt.
nin error.log nul "(\w*Exception)" -pd -H 30 : Get error categories, distribution and percentage, output top 30 errors.
nin error.log nul "(\w*Exception)" -pd -H 30 -I > report.txt : Save top 30 errors + summary info to report.txt.
nin error.log nul "(\w*Exception)" -pd -H 30 -PAC : Get top 30 errors of raw text without percentages and summary info.
nin my-config.ini exclude.csv "name = (\w+Exception)" "(\w+Exception)" -iwn > new-config.ini : Output whole lines in my-config.ini except lines also captured in exclude.csv.
nin -h -C | nin nul "^\s{2}(-+\S+)\s+" -w --nt help : Get all command options of nin and output with original order.
nin -h -C | nin nul "^\s{2}-(\w)\s+" -wa --nt help : Get all single letter command options of nin and output with ascending order.
nin -h -C | nin nul "^\s{2}-(\w)\s+" -wpdi : Get percentages of nin single letter command options.
nin -h -C | nin nul "^\s{2}-(\w)\s+" -wpdi -k 2 : Get percentages of nin single letter command options which matched count >= 2.
nin -h -C | nin nul "^\s{2}-(\w)\s+" -wpdi -K 5.0 : Get percentages of nin single letter command options which percentage >= 5%.
nin -h -C | nin nul "^\s{2}-(\w)\s+" -wpdi -k 2 -K 5.0 -P : Get percentages of nin single letter command options: count >= 2 and percentage >= 5% without percentage info.

One limitation: Cannot process Unicode files or pipe for now; Fine with UTF-8/ANSI/etc.
Search usage like: nin -h | msr -i -t return.+value  or  nin -hC | msr -it "Summary|Jump|Sort" -x out -U 2 -D2  or  nin | msr -ix switch -t Regex -e "latter|first"
You can preset env: MSR_EXIT, MSR_OUT_INDEX, MSR_NO_COLOR, MSR_COLORS, MSR_OUT_FULL_PATH, MSR_NOT_WARN_BOM, MSR_SKIP_LAST_EMPTY, MSR_KEEP_COLOR, MSR_UNIX_SLASH for --unix-slash / --keep-color / etc.

With msr.cygwin more powerful to load files/read pipe, extract/transform, pre/post-processing: https://github.com/qualiu/msr
Example: Get insensitive unique paths + descending sort-by-percentage to show top 2 duplicate paths + Merge trimmed one line paths to new $PATH:
    msr -z "$PATH" -t "/*?\s*:\s*" -o "\n" -aPAC | nin nul "(\S+.+)" -i -u
    msr -z "$PATH" -t "/*?\s*:\s*" -o "\n" -aPAC | nin nul "(\S+.+)" -i -u -d -p -k 2
    msr -z "$PATH" -t "/*?\s*:\s*" -o "\n" -aPAC | nin nul "(\S+.+)" -i -u -PAC | msr -S -t "[\r\n]+(\S+)" -o ':\1' -aPAC

As a portable cross platform tool, nin has been running on: Windows / MinGW / Cygwin / Ubuntu / CentOS / Fedora / Darwin / FreeBSD
Aperiodic updates: https://github.com/qualiu/msr , more tools: https://github.com/qualiu/msrTools + https://github.com/qualiu/msrUI + https://github.com/qualiu/vscode-msr
Call@Everywhere: Add nin.cygwin to system environment variable PATH with nin.cygwin directory like(copy or rename nin.cygwin to nin): export PATH="$PATH:/home/qualiu/tool"
         or by alias : alias nin='/home/qualiu/tool/nin.cygwin'
         or by link : ln -sf '/home/qualiu/tool/nin.cygwin' /usr/bin/nin
         or copy to system : cp -ap '/home/qualiu/tool/nin.cygwin' /usr/bin/nin

qualiu@mypc /cygdrive/c/Users/qualiu
$