{"id":13363,"date":"2025-11-02T18:41:26","date_gmt":"2025-11-02T18:41:26","guid":{"rendered":"https:\/\/davelevy.info\/wiki\/?p=13363"},"modified":"2025-11-02T18:45:06","modified_gmt":"2025-11-02T18:45:06","slug":"scripting-on-the-raspberry-pi","status":"publish","type":"post","link":"https:\/\/davelevy.info\/wiki\/scripting-on-the-raspberry-pi\/","title":{"rendered":"Scripting on the raspberry pi"},"content":{"rendered":"\n

This post talks about scripting on raspbian. I have two problems, cron and privilege and running a java script …<\/p>\n\n\n\n\n\n\n\n

cron & privilege<\/h3>\n\n\n\n

My script, run_aptjob requires sudo authentication and so asks for it from the gui when run from crontab despite being defined in the root crontab file and called using the sudo command. <\/p>\n\n\n\n

    \n
  1. See https:\/\/stackoverflow.com\/questions\/60754639\/sudo-asks-for-password-in-cronjob-script-but-the-same-script-works-without-passw<\/a><\/li>\n\n\n\n
  2. And https:\/\/askubuntu.com\/questions\/419548\/how-to-set-up-a-root-cron-job-properly<\/a><\/li>\n\n\n\n
  3. https:\/\/forums.raspberrypi.com\/viewtopic.php?t=296993<\/a><\/li>\n\n\n\n
  4. https:\/\/raspberrypi.stackexchange.com\/questions\/57835\/why-my-script-is-not-executed-with-root-privileges-using-crontab<\/a><\/li>\n\n\n\n
  5. https:\/\/raspberrypi.stackexchange.com\/questions\/32955\/cron-job-doesnt-work-but-runs-successfully-manually<\/a>, looks like a syntax error<\/li>\n<\/ol>\n\n\n\n

    java<\/h3>\n\n\n\n

    I can’t get the script to run from a batch file, I need to set DISPLAY and pass the -input parameter to the command line. It was working but now isn’t. <\/p>\n\n\n\n

    export DISPLAY=:10.0\njava -jar \/opt\/java\/ksar-latest -input ${YESTERDAY}<\/code><\/pre>\n\n\n\n
    This code works from the command line where $YESTERDAY is yesterday’s SAR text file. <\/p>\n\n\n\n
    Does DISPLAY need to be passed over using the -D flag?<\/p>\n\n\n\n
    Otherwise, I found these, <\/p>\n\n\n\n
      \n
    1. https:\/\/unix.stackexchange.com\/questions\/226008\/how-to-pass-arguments-to-a-java-process-from-within-a-shell-script<\/a><\/li>\n\n\n\n
    2. https:\/\/stackoverflow.com\/questions\/8123058\/passing-on-command-line-arguments-to-runnable-jar<\/a><\/li>\n\n\n\n
    3. how to get a .jar to display its options, usually java -jar ${jarfile} –help should work, it did for me.<\/li>\n\n\n\n
    4. This on duckduckgo<\/a> gave a number of options<\/li>\n<\/ol>\n\n\n\n
      <\/p>\n","protected":false},"excerpt":{"rendered":"
      This post talks about scripting on raspbian. I have two problems, cron and privilege and running a java script …<\/p>\n","protected":false},"author":1,"featured_media":9915,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_share_on_mastodon":"0"},"categories":[3],"tags":[994,1286,373,911],"class_list":["post-13363","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology","tag-raspberry-pi","tag-raspbian","tag-scripting","tag-technology"],"share_on_mastodon":{"url":"https:\/\/mastodon.social\/@davelevy_eu\/115481568108122738","error":""},"jetpack_featured_media_url":"https:\/\/davelevy.info\/wiki\/wp-content\/uploads\/2013\/09\/code-pankajpatel-unsplash-w1080.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/posts\/13363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/comments?post=13363"}],"version-history":[{"count":2,"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/posts\/13363\/revisions"}],"predecessor-version":[{"id":13365,"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/posts\/13363\/revisions\/13365"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/media\/9915"}],"wp:attachment":[{"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/media?parent=13363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/categories?post=13363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/davelevy.info\/wiki\/wp-json\/wp\/v2\/tags?post=13363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}