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1 <tool id="unixtools_head_tool" name="Select first" version="0.1.1">
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2 <description>lines from a dataset (head)</description>
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3 <requirements>
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4 <requirement type="package" version="8.21">gnu_coreutils</requirement>
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5 </requirements>
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6 <command>
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7 head --lines $complement$count '${infile}' > '${outfile}'
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8 </command>
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9
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10 <inputs>
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11 <param format="txt" name="infile" type="data" label="file to cut" />
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12
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13 <param name="complement" type="select" label="Operation">
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14 <option value="">Keep first lines</option>
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15 <option value="-">Remove last lines</option>
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16 </param>
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17
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18 <param name="count" type="integer" size="5" value="10" label="Number of lines" help="These will be kept/discarded (depending on 'operation').">
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19 <sanitizer>
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20 <valid initial="string.printable">
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21 <remove value="'"/>
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22 </valid>
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23 </sanitizer>
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24 </param>
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25 </inputs>
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26
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27 <outputs>
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28 <data format="input" name="outfile" metadata_source="infile"/>
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29 </outputs>
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30 <help>
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31
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32 **What it does**
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33
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34 This tool runs the **head** unix command, which discards lines from the end of a file.
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35
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36 </help>
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37 </tool>
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