If I just copy/paste the examples from this page, I get an error like
this:

    No idea what 'perdulce.torproject.org' is!

This is because the last sed command in subshells that fetch information
is not doing what it should since output is separated by newlines
instead of spaces. With `paste` we can make this work better.

howto/upgrades.md

@@ -435,24 +435,24 @@ This routine should be able to reboot all hosts with a `rebootPolicy`
 defined to `justdoit` or `rotation`:
 
     echo "rebooting 'justdoit' hosts with a 10-minute delay, every 2 minutes...."
-    fab -H $(ssh db.torproject.org 'ldapsearch -H ldap://db.torproject.org -x -ZZ -b ou=hosts,dc=torproject,dc=org -LLL "(rebootPolicy=justdoit)" hostname | awk "\$1 == \"hostname:\" {print \$2}" | sort -R' | sed 's/ /,/g') fleet.reboot-host --delay-shutdown=10 --delay-hosts=120
+    fab -H $(ssh db.torproject.org 'ldapsearch -H ldap://db.torproject.org -x -ZZ -b ou=hosts,dc=torproject,dc=org -LLL "(rebootPolicy=justdoit)" hostname | awk "\$1 == \"hostname:\" {print \$2}" | sort -R' | paste -sd ',') fleet.reboot-host --delay-shutdown=10 --delay-hosts=120
 
     echo "rebooting 'rotation' hosts with a 10-minute delay, every 30 minutes...."
-    fab -H $(ssh db.torproject.org 'ldapsearch -H ldap://db.torproject.org -x -ZZ -b ou=hosts,dc=torproject,dc=org -LLL "(rebootPolicy=rotation)" hostname | awk "\$1 == \"hostname:\" {print \$2}" | sort -R' | sed 's/ /,/g') fleet.reboot-host --delay-shutdown=10 --delay-hosts=1800
+    fab -H $(ssh db.torproject.org 'ldapsearch -H ldap://db.torproject.org -x -ZZ -b ou=hosts,dc=torproject,dc=org -LLL "(rebootPolicy=rotation)" hostname | awk "\$1 == \"hostname:\" {print \$2}" | sort -R' | paste -sd ',') fleet.reboot-host --delay-shutdown=10 --delay-hosts=1800
 
 Another example, this will reboot all hosts running Debian `bookworm`,
 in random order:
 
-    fab -H $(ssh puppetdb-01.torproject.org "curl -s -G http://localhost:8080/pdb/query/v4 --data-urlencode 'query=inventory[certname] { facts.os.distro.codename = \"bookworm\" }'" | jq -r '.[].certname' | sort -R | sed 's/ /,/g')
+    fab -H $(ssh puppetdb-01.torproject.org "curl -s -G http://localhost:8080/pdb/query/v4 --data-urlencode 'query=inventory[certname] { facts.os.distro.codename = \"bookworm\" }'" | jq -r '.[].certname' | sort -R | paste -sd ',')
 
 And this will reboot all hosts with a pending kernel upgrade (updates
 only when puppet agent runs), again in random order:
 
-    fab -H $(ssh puppetdb-01.torproject.org "curl -s -G http://localhost:8080/pdb/query/v4 --data-urlencode 'query=inventory[certname] { facts.apt_reboot_required = true }'" | jq -r '.[].certname' | sort -R | sed 's/ /,/g')
+    fab -H $(ssh puppetdb-01.torproject.org "curl -s -G http://localhost:8080/pdb/query/v4 --data-urlencode 'query=inventory[certname] { facts.apt_reboot_required = true }'" | jq -r '.[].certname' | sort -R | paste -sd ',')
 
 And this is the list of all *physical* hosts with a pending upgrade, alphabetically:
 
-    fab -H $(ssh puppetdb-01.torproject.org "curl -s -G http://localhost:8080/pdb/query/v4 --data-urlencode 'query=inventory[certname] { facts.apt_reboot_required = true and facts.virtual = \"physical\" }'" | jq -r '.[].certname'  | sort | sed 's/ /,/g')
+    fab -H $(ssh puppetdb-01.torproject.org "curl -s -G http://localhost:8080/pdb/query/v4 --data-urlencode 'query=inventory[certname] { facts.apt_reboot_required = true and facts.virtual = \"physical\" }'" | jq -r '.[].certname'  | sort | paste -sd ',')
 
 ## Rebooting Ganeti nodes