sed

good info: https://www.grymoire.com/Unix/Sed.html

• change multiple values at column position for multiple records

sed -e 's/./X/10' -e '/^000/s/./X/18' -e '/^001/s/./X/819' input

• grep uppercase words preceded by '-' & followed by ','

grep -oP "\-\w[A-Z]+\w," xxx

* print lines between patterns(inclusive) & stop
sed -n '/^pattern1/,/^pattern2/p;/^pattern2/q'

* print lines between patterns(exclusive)
sed -n '1,/^pattern1/d;/^pattern2/,$d;p'

* count # of lines between patterns (EMPLID)
awk '/EMPLID/ {if (count) print count; print; count=0; next} {count++} END {print count}' file

* replace char if pattern found
 sed '/^Box 14/ s/#/^/g' file

*insert line after pattern
sed '/pattern/a insert_text_line' file

*insert line before pattern
(https://fabianlee.org/2018/10/28/linux-using-sed-to-insert-lines-before-or-after-a-match/)

sed '/^anothervalue=.*/i before=me' test.txt

insert multiple lines

sed '/^anothervalue=.*/i before=me\nbefore2=me2' test.txt

* add text to pattern:
echo '123 pattern 456' | sed 's/\<pattern\>/xxx&xxx/' 
echo '123 pattern 456' | sed 's/\(pattern\)/xxx\1xxx/' 
echo '123 pattern 456' | sed 's/\(pattern\) 4\(.*\)6/xxx\1xxx \2/' 

* replace extended ascii with spaces:

SET KK_CLOSE_FLAG =Â 'N' | LANG=C sed 's/[\x80-\xFF]//g' 

* print from match to end of file:
> sed -ne '/pattern/,$ p'
  # alternatively, if you don't want to print the match:

> sed -e '1,/pattern/ d'

* Branching to Label:
> echo -e "a\nb\nc\nd\ne\nf\ng\nh" | 

sed '3b action; /e/{p; b action;}; b end; : action; a \
lalala
: end'

https://unix.stackexchange.com/questions/117511/is-it-possible-to-match-multiple-specific-line-numbers-not-range-with-sed

* print lines between two patterns, inclusive or exclusive (in sed, AWK or Perl)

https://stackoverflow.com/questions/38972736/how-to-print-lines-between-two-patterns-inclusive-or-exclusive-in-sed-awk-or