On Thu, Jul 17, 2025 at 1:58 AM Russell Senior <russ...@personaltelco.net> wrote:
> Here's what I came up with: > > curl -s https://forecast.weather.gov/xml/current_obs/KEUG.xml | sed > 's/\(<\/[^!>]\+>\)/\1\n/g' | grep temp_f | cut -d\> -f2 | cut -d\< -f1 > > the sed adds a newline to any close-tags </foo>, grep picks the line, > and the cuts get rid of the wrapping tags. > > Or, since xml parsing utilities exist: > > sudo apt install xmlstarlet > > then: > > curl -s https://forecast.weather.gov/xml/current_obs/KEUG.xml | > xmlstarlet sel -t -v "//temp_f" - > > or maybe even: > > echo $(curl -s https://forecast.weather.gov/xml/current_obs/KEUG.xml > | xmlstarlet sel -t -v "//temp_f" -) > > -- > Russell Senior > russ...@personaltelco.net > > On Wed, Jul 16, 2025 at 11:59 PM Ben Koenig <techkoe...@protonmail.com> > wrote: > > > > > > > > > > > > -Ben > > > > > > On Wednesday, July 16th, 2025 at 11:05 PM, Ben Koenig < > techkoe...@protonmail.com> wrote: > > > > > On Wednesday, July 16th, 2025 at 9:57 PM, Michael Barnes > barnmich...@gmail.com wrote: > > > > > > > I have a script that is supposed to grab a weather feed and return > the > > > > current temperature. If grabs the file fine, but does not return the > > > > temperature. > > > > > > > > Here is the line that fails: > > > > > > > > T=$(grep "<temp_f>" KEUG.xml |cut -c10- |cut -d '.' -f 1) > > > > > > > > Here is the KEUG.xml file: > > > > <?xml version="1.0" encoding="ISO-8859-1"?> > > > > > > > > <?xml-stylesheet href="latest_ob.xsl" type="text/xsl"?> > > > > > > > > <current_observation version="1.0" xmlns:xsd=" > > > > http://www.w3.org/2001/XMLSchema"; xmlns:xsi=" > > > > http://www.w3.org/2001/XMLSchema-instance"; > xsi:noNamespaceSchemaLocation=" > > > > http://www.weather.gov/view/current_observation.xsd";><credit>NOAA's > > > > > > > > National Weather Service</credit><credit_URL>https://weather.gov/ > > > > > > > > </credit_URL><image><url> > http://forecast.weather.gov/images/xml_badge.png</url><title>NOAA's > > > > > > > > National Weather > > > > Service</title><link>https://www.weather.gov > </link></image><suggested_pickup>15 > > > > > > > > minutes after the > > > > > hour</suggested_pickup><suggested_pickup_period>60</suggested_pickup_period><location>Eugene, > > > > > > > > Mahlon Sweet Field, > > > > > OR</location><station_id>KEUG</station_id><latitude>44.13333</latitude><longitude>-123.21444</longitude><observation_time>Last > > > > > > > > Update on Jul 16 2025, 7:54 pm > > > > PDT</observation_time><observation_time_rfc822>Wed, 16 Jul 2025 > 19:54:00 > > > > > > > > > -0700</observation_time_rfc822><weather>Fair</weather><temperature_string>88.0 > > > > > > > > F (31.1 > > > > > C)</temperature_string><temp_f>88.0</temp_f><temp_c>31.1</temp_c><relative_humidity>26</relative_humidity><wind_string>West > > > > > > > > at 8.1 MPH (7 > > > > > KT)</wind_string><wind_dir>West</wind_dir><wind_degrees>250</wind_degrees><wind_mph>8.1</wind_mph><wind_kt>7</wind_kt><pressure_string>1008 > > > > > > > > > mb</pressure_string><pressure_mb>1008</pressure_mb><pressure_in>29.78</pressure_in><dewpoint_string>48.9 > > > > > > > > F (9.4 > > > > > C)</dewpoint_string><dewpoint_f>48.9</dewpoint_f><dewpoint_c>9.4</dewpoint_c><heat_index_string>85 > > > > > > > > F (30 > > > > > C)</heat_index_string><heat_index_f>85</heat_index_f><heat_index_c>30</heat_index_c><visibility_mi>10.00</visibility_mi><icon_url_base> > > > > > > > > http://forecast.weather.gov/images/wtf/small/ > > > > </icon_url_base><two_day_history_url> > > > > > > > > http://forecast.weather.gov/data/obhistory/KEUG.html > > > > </two_day_history_url><icon_url_name>nskc.png</icon_url_name><ob_url> > > > > > > > > http://forecast.weather.gov/data/METAR/KEUG.1.txt > </ob_url><disclaimer_url> > > > > > > > > https://www.weather.gov/disclaimer.html > </disclaimer_url><copyright_url> > > > > > > > > https://www.weather.gov/disclaimer.html > </copyright_url><privacy_policy_url> > > > > > > > > https://www.weather.gov/notice.html > > > > </privacy_policy_url></current_observation> > > > > > > > > I should get: > > > > > > > > $ echo $T > > > > 88 > > > > > > > > Instead, I get: > > > > $ echo $T > > > > observation version="1 > > > > > > > > This has been working for several years. The script runs each hour, > pulling > > > > the weather statement and culling the current temperature. The > remainder of > > > > the script uses the variable to select the appropriate audio file to > > > > announce the current temperature. I set this up about five years ago > and my > > > > feeble memory has no idea how it really works any more. > > > > > > > > Any ideas on what went wrong where? > > > > > > > > Thanks, > > > > Michael > > > > > > > > > > > > I think the linebreaks are missing in your datafile. you are using > grep to search for a specific line and then cut from there, but if newlines > are removed from the xml then it does what you described. > > > > > > XML does not require newlines in order to be valid and it's possible > that the source of your data no longer prints the data with them. > > > > > > You will either need to make sure the downloaded xml includes all the > expected new lines or adjust the script to make sure it doesn't matter. > > > > > > -Ben > > > > This might be a more robust one-liner to get the information you need: > > > > T=$(awk -F'temp_f>|</temp_f' '{print $2}' KEUG.xml | cut -d. -f1) > Using other software may be a better choice, but not an option at this time. I do not have access to the computer running this and limited on-site assistance. They are able to go in and replace the script, but they do not have command line access or knowledge. It will be some time before I am able to travel there and lay hands on the machine. Unfortunately, I no longer have remote access. I will keep this option in mind for when I do get there and can touch the beast. Thanks, Michael
