Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>A bit hacky, but this should do it:</p> <pre><code>echo "${ids[@]}" | tr ' ' '\n' | sort -u | tr '\n' ' ' </code></pre> <p>To save the sorted unique results back into an array, do <a href="https://github.com/koalaman/shellcheck/wiki/SC2178">Array assignment</a>:</p> <pre><code>sorted_unique_ids=($(echo "${ids[@]}" | tr ' ' '\n' | sort -u | tr '\n' ' ')) </code></pre> <p>If your shell supports <a href="http://linux.die.net/abs-guide/x15683.html">herestrings</a> (<code>bash</code> should), you can spare an <code>echo</code> process by altering it to:</p> <pre><code>tr ' ' '\n' &lt;&lt;&lt; "${ids[@]}" | sort -u | tr '\n' ' ' </code></pre> <p><strong>Input:</strong></p> <pre><code>ids=(aa ab aa ac aa ad) </code></pre> <p><strong>Output:</strong></p> <pre><code>aa ab ac ad </code></pre> <p><strong>Explanation:</strong></p> <ul> <li><code>"${ids[@]}"</code> - Syntax for working with shell arrays, whether used as part of <code>echo</code> or a herestring. The <code>@</code> part means "all elements in the array"</li> <li><code>tr ' ' '\n'</code> - Convert all spaces to newlines. Because your array is seen by shell as elements on a single line, separated by spaces; and because sort expects input to be on separate lines.</li> <li><code>sort -u</code> - sort and retain only unique elements</li> <li><code>tr '\n' ' '</code> - convert the newlines we added in earlier back to spaces.</li> <li><code>$(...)</code> - <a href="http://tldp.org/LDP/abs/html/commandsub.html">Command Subsitution</a></li> <li>Aside: <code>tr ' ' '\n' &lt;&lt;&lt; "${ids[@]}"</code> is a more efficient way of doing: <code>echo "${ids[@]}" | tr ' ' '\n'</code></li> </ul>
    singulars
    1. This table or related slice is empty.
    1. POHow can I get unique values from an array in Bash?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USDawid Gosławski
    1. USsampson-chen
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow can I get unique values from an array in Bash?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. CO+1. A bit tidier: store uniq elements in a new array: `uniq=($(printf "%s\n" "${ids[@]}" | sort -u)); echo "${uniq[@]}"`
      singulars
      1. PO
      1. USglenn jackman
    2. CO@glennjackman oh neat! I didn't even realize you can use `printf` that way (give more arguments than format strings)
      singulars
      1. PO
      1. USsampson-chen
    3. COYes, the format string gets reused until all the arguments are consumed -- it's very handy
      singulars
      1. PO
      1. USglenn jackman
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload