linux - Nested grep with SSH -

i have following shell command runs successfully:

sed -e "1,/^$(date -d -24hour +'%y-%m-%d %h')/d" logfile | grep -a20 -b10 'exception' | mail -s "sample report" xyz@yourdomain 

however, have ssh particular machine run this. avoid this, modified in following way leads failure:

ssh myserver 'sed -e "1,/^$(date -d -24hour +'%y-%m-%d %h')/d" logfile | grep -a20 -b10 'exception' | mail -s "sample report" xyz@yourdomain ' 

what wrong command? how can fix this?

embed code in quoted heredoc avoid needing modify (which error-prone process nature):

ssh myserver 'bash -s' <<'eof'   sed -e "1,/^$(date -d -24hour +'%y-%m-%d %h')/d" logfile \     | grep -a20 -b10 'exception' \     | mail -s "sample report" xyz@yourdomain eof 

---

in specific case here, obvious reason original modifications failed internal single quotes terminating ones surrounding code whole.

specifically:

+'%y-%m-%d %h' 

...the first ' in expression terminates 1 opening before command, space isn't syntactically protected.

you instead following, since shell bash:

ssh myserver $'sed -e "1,/^$(date -d -24hour +\'%y-%m-%d %h\')/d" logfile | grep -a20 -b10 exception | mail -s "sample report" xyz@yourdomain' 

$'' extension within backslashes can escape single quotes (and used other literals -- \n newline, \t tab, etc), functionality not available typical posix sh syntax.

by contrast, in posix sh, 1 can switch quoting types embed literal single-quote: 'foo'"'"'bar' defines string both foo , bar single-quoted, , separated single literal single-quote between them -- valid syntax, not easy readers unfamiliar idiom process).