Rdb: Ruby-Nachbau der MWC /rdb-Werkzeuge

man/cashflow.man

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+.TH cashflow "" "" "/rdb Command"
+.PC "Compute balance column of cash table"
+\fBcashflow < \fIcashtable\fR
+.PP
+.II "compute cash flow"
+.II "cash flow"
+The command
+.B cashflow
+helps you manage your cash flow.
+It reads
+.IR cashtable ,
+which you design,
+then computes a running balance in a
+.I Balance
+column (which must be column 3) from an
+.I Amount
+column (which must be column 2).
+.PP
+Cash-flow analysis lets you see if you will always have enough money
+in hand to cover each day's bills.
+It makes cash management possible by
+telling you whether to put off an expense until a check arrives,
+ask for an advance, get to work and make more money,
+or control your spending.
+.SH Example
+The following gives an example
+.IR cashtable ,
+called
+.BR cash :
+.DM
+Date     Amount   Balance   Description
+------   ------   -------   -----------
+890101                512   current balance
+890101     -450             rent check
+890101     1000             pay check
+890115     -300             estimated tax payment
+890115     1000             pay check
+890115    -1000             living expenses
+890120     -900             big purchase
+.DE
+.DM
+890201     1000             pay check
+890201     -450             rent check
+890215     1000             pay check
+890115    -1000             living expenses
+.DE
+.PP
+The command
+.B cashflow
+needs two columns, named
+.B Amount
+and
+.B Balance.
+(If you use different column names, you must edit the
+.B cashflow
+shell script).
+All other columns are optional.
+Each row in your table represents
+a projected income item (positive) or a projected expense (negative).
+This is your flow of cash.
+To summarize the cash flow in our example table
+.BR cash ,
+type:
+.DM
+   cashflow < cash
+.DE
+.PP
+This prints the following on your screen:
+.DM
+Date     Amount   Balance   Description
+------   ------   -------   -----------
+890101      512       512   current balance
+890101     -450        62   rent check
+890101     1000      1062   pay check
+890115     -300       762   estimated tax payment
+890115     1000      1762   pay check
+890115    -1000       762   living expenses
+890120     -900      -138   big purchase
+.DE
+.DM
+890201     1000       862   pay check
+890201     -450       412   rent check
+890215     1000      1412   pay check
+890115    -1000       412   living expenses
+.DE
+.PP
+That
+.B "big purchase"
+gives us a negative balance in 890120.
+Now that you know, you can do something about it.
+One move is to put the big purchase off
+until the first of February.
+After you edit table
+.B cash
+to reflect this change, it appears as follows:
+.DM
+Date     Amount   Balance   Description
+------   ------   -------   -----------
+890101                512   current balance
+890101     -450             rent check
+890101     1000             pay check
+890115     -300             estimated tax payment
+890115     1000             pay check
+890115    -1000             living expenses
+890201     1000             pay check
+890201     -900             big purchase
+890201     -450             rent check
+890215     1000             pay check
+890115    -1000             living expenses
+.DE
+.PP
+Running
+.B cashflow
+again will tell us if this strategy works:
+.DM
+Date     Amount   Balance   Description
+------   ------   -------   -----------
+890101      512       512   current balance
+890101     -450        62   rent check
+890101     1000      1062   pay check
+890115     -300       762   estimated tax payment
+890115     1000      1762   pay check
+890115    -1000       762   living expenses
+890201     1000      1762   pay check
+890201     -900       862   big purchase
+890201     -450       412   rent check
+890215     1000      1412   pay check
+890115    -1000       412   living expenses
+.DE
+.PP
+As you can see, this works \(em there's no negative cash flow for any
+period.
+You can also try other options.
+.PP
+You can do all of the inputting and editing in the text editor.
+You can execute commands in
+.B vi
+by using the exclamation `!' shell feature;
+or from MicroEMACS by typing \fB<ctrl-X>!\fR.
+You also might want to write out to a
+.I tmp
+file and use
+.B mv
+to overwrite your
+.B cash
+table so that it is
+file is up to date.
+For example, in
+.B vi
+you can type:
+.DM
+	:!cashflow < cashtable > tmp ; mv tmp cashtable
+	:e!
+.DE
+.PP
+The first line computes the
+.B Balance
+column, writes the result into a
+.B tmp
+file, and moves
+.B tmp
+to be the new
+.B cashtable.
+All of this is necessary because
+in COHERENT you cannot have one file
+as both input and output without wiping out the file.
+The second line,
+.B :e!
+pulls the new file into the
+.B vi
+editor and displays it on your screen.
+.SH "See Also"
+COHERENT Lexicon:
+.B
+ksh,
+me,
+sh,
+vi
+.R
+.SO cashflow