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### 6.1 Processing Filters

This section lists the filter commands which can be used for table pipeline processing, in conjunction with `cmd`- or `script`-type parameters.

You can string as many of these together as you like. On the command line, you can repeat the `cmd` (or `icmd1`, or `ocmd`...) parameter multiple times, or use one `cmd` parameter and separate different filter specifiers with semicolons ("`;`"). The effect is the same.

It's important to note that each command in the sequence of processing steps acts on the table at that point in the sequence. Thus either of the two identical invocations:

       stilts tpipe cmd='delcols 1; delcols 1; delcols 1'
       stilts tpipe cmd='delcols 1' cmd='delcols 1' cmd='delcols 1'

has the same effect as

       stilts tpipe cmd='delcols "1 2 3"'

since in the first case the columns are shifted left after each one is deleted, so the table seen by each step has one fewer column than the one before. Note also the use of quotes in the latter of the examples above, which is necessary so that the `<colid-list>` of the `delcols` command is interpreted as one argument not three separate words.

The available filters are described in the following subsections.

- 6.1.1 `addcol`
- 6.1.2 `addpixsample`
- 6.1.3 `addresolve`
- 6.1.4 `addskycoords`
- 6.1.5 `assert`
- 6.1.6 `badval`
- 6.1.7 `cache`
- 6.1.8 `check`
- 6.1.9 `clearparams`
- 6.1.10 `collapsecols`
- 6.1.11 `colmeta`
- 6.1.12 `constcol`
- 6.1.13 `delcols`
- 6.1.14 `every`
- 6.1.15 `explodeall`
- 6.1.16 `explodecols`
- 6.1.17 `fixcolnames`
- 6.1.18 `group`
- 6.1.19 `head`
- 6.1.20 `healpixmeta`
- 6.1.21 `keepcols`
- 6.1.22 `meta`
- 6.1.23 `progress`
- 6.1.24 `random`
- 6.1.25 `randomview`
- 6.1.26 `repeat`
- 6.1.27 `replacecol`
- 6.1.28 `replaceval`
- 6.1.29 `rowrange`
- 6.1.30 `select`
- 6.1.31 `seqview`
- 6.1.32 `setparam`
- 6.1.33 `shuffle`
- 6.1.34 `sort`
- 6.1.35 `sorthead`
- 6.1.36 `stats`
- 6.1.37 `tablename`
- 6.1.38 `tail`
- 6.1.39 `transpose`
- 6.1.40 `uniq`

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STILTS - Starlink Tables Infrastructure Library Tool Set
Starlink User Note256
STILTS web page: http://www.starlink.ac.uk/stilts/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk