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Kusalananda ♦
Kusalananda ♦
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Using standard sed and assuming every line contains exactly one START and one END substring (in that order):

# Skip (pass through) lines that does not have START followed by END.
/.*START\(.*\)END.*/ !b

# Save the original line in the hold space.
h

# Remove the start and the end from the line.
# This leaves the bit of the line that we want to modify.
# (This reuses the previous regular expression.)
s//\1/

# Modify what's left.
s/_this_//
s/modi/MODI/
y/as/45/

# Append the original line from the hold space,
# with a newline as delimiter.
G

# Move the modified bit into the correct spot with a substitution,
# while deleting the old substring between START and END.
s/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/

Testing:

$ cat file
aomodi3hriq32| ¶³r 0q93aoiSTART_this_is_to_be_modified_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART_this_also_needs_modification_ENDqa 032/a237(°1Q"§ >A_this_
START changeme ENDnot_this_modias

$ sed -f script file
aomodi3hriq32| ¶³r 0q93aoiSTARTi5_to_be_MODIfied_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART4l5o_need5_MODIfic4tion_ENDqa 032/a237(°1Q"§ >A_this_
START ch4ngeme ENDnot_this_modias

In-line, on the command line:

sed -e '/.*START\(.*\)END.*/!b' -e h -e 's//\1/' \
    -e 's/_this_//' -e 's/modi/MODI/' -e 'y/as/45/' \
    -e G -e 's/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/' file

Using standard sed and assuming every line contains exactly one START and one END substring (in that order):

# Skip (pass through) lines that does not have START followed by END.
/.*START\(.*\)END.*/ !b

# Save the original line in the hold space.
h

# Remove the start and the end from the line.
# This leaves the bit of the line that we want to modify.
# (This reuses the previous regular expression.)
s//\1/

# Modify what's left.
s/_this_//
s/modi/MODI/
y/as/45/

# Append the original line from the hold space,
# with a newline as delimiter.
G

# Move the modified bit into the correct spot with a substitution,
# while deleting the old substring between START and END.
s/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/

Testing:

$ cat file
aomodi3hriq32| ¶³r 0q93aoiSTART_this_is_to_be_modified_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART_this_also_needs_modification_ENDqa 032/a237(°1Q"§ >A_this_
START changeme ENDnot_this_modias

$ sed -f script file
aomodi3hriq32| ¶³r 0q93aoiSTARTi5_to_be_MODIfied_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART4l5o_need5_MODIfic4tion_ENDqa 032/a237(°1Q"§ >A_this_
START ch4ngeme ENDnot_this_modias

Using standard sed and assuming every line contains exactly one START and one END substring (in that order):

# Skip (pass through) lines that does not have START followed by END.
/.*START\(.*\)END.*/ !b

# Save the original line in the hold space.
h

# Remove the start and the end from the line.
# This leaves the bit of the line that we want to modify.
# (This reuses the previous regular expression.)
s//\1/

# Modify what's left.
s/_this_//
s/modi/MODI/
y/as/45/

# Append the original line from the hold space,
# with a newline as delimiter.
G

# Move the modified bit into the correct spot with a substitution,
# while deleting the old substring between START and END.
s/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/

Testing:

$ cat file
aomodi3hriq32| ¶³r 0q93aoiSTART_this_is_to_be_modified_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART_this_also_needs_modification_ENDqa 032/a237(°1Q"§ >A_this_
START changeme ENDnot_this_modias

$ sed -f script file
aomodi3hriq32| ¶³r 0q93aoiSTARTi5_to_be_MODIfied_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART4l5o_need5_MODIfic4tion_ENDqa 032/a237(°1Q"§ >A_this_
START ch4ngeme ENDnot_this_modias

In-line, on the command line:

sed -e '/.*START\(.*\)END.*/!b' -e h -e 's//\1/' \
    -e 's/_this_//' -e 's/modi/MODI/' -e 'y/as/45/' \
    -e G -e 's/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/' file
added 2 characters in body
Source Link
Kusalananda ♦
Kusalananda ♦
  • 356.2k
  • 42
  • 737
  • 1.1k

Using standard sed and assuming every line contains exactly one START and one END substring (in that order):

# Skip (pass through) lines that does not have START followed by END.
/.*START\(.*\)END.*/ !b

# Save the original line in the hold space.
h

# Remove the start and the end from the line.
# This leaves the bit of the line that we want to modify.
s/# (This reuses the previous regular expression.*START//)
s/END.*/\1/

# Modify what's left.
s/_this_//
s/modi/MODI/
y/as/45/

# Append the original line from the hold space,
# with a newline as delimiter.
G

# Move the modified bit into the correct spot with a substitution,
# while deleting the old substring between START and END.
s/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/

Testing:

$ cat file
aomodi3hriq32| ¶³r 0q93aoiSTART_this_is_to_be_modified_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART_this_also_needs_modification_ENDqa 032/a237(°1Q"§ >A_this_
START changeme ENDnot_this_modias

$ sed -f script file
aomodi3hriq32| ¶³r 0q93aoiSTARTi5_to_be_MODIfied_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART4l5o_need5_MODIfic4tion_ENDqa 032/a237(°1Q"§ >A_this_
START ch4ngeme ENDnot_this_modias

Using standard sed and assuming every line contains exactly one START and one END substring (in that order):

# Save the original line in the hold space.
h

# Remove the start and the end from the line.
# This leaves the bit of the line that we want to modify.
s/.*START//
s/END.*//

# Modify what's left.
s/_this_//
s/modi/MODI/
y/as/45/

# Append the original line from the hold space,
# with a newline as delimiter.
G

# Move the modified bit into the correct spot with a substitution,
# while deleting the old substring between START and END.
s/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/

Testing:

$ cat file
aomodi3hriq32| ¶³r 0q93aoiSTART_this_is_to_be_modified_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART_this_also_needs_modification_ENDqa 032/a237(°1Q"§ >A_this_
START changeme ENDnot_this_modias

$ sed -f script file
aomodi3hriq32| ¶³r 0q93aoiSTARTi5_to_be_MODIfied_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART4l5o_need5_MODIfic4tion_ENDqa 032/a237(°1Q"§ >A_this_
START ch4ngeme ENDnot_this_modias

Using standard sed and assuming every line contains exactly one START and one END substring (in that order):

# Skip (pass through) lines that does not have START followed by END.
/.*START\(.*\)END.*/ !b

# Save the original line in the hold space.
h

# Remove the start and the end from the line.
# This leaves the bit of the line that we want to modify.
# (This reuses the previous regular expression.)
s//\1/

# Modify what's left.
s/_this_//
s/modi/MODI/
y/as/45/

# Append the original line from the hold space,
# with a newline as delimiter.
G

# Move the modified bit into the correct spot with a substitution,
# while deleting the old substring between START and END.
s/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/

Testing:

$ cat file
aomodi3hriq32| ¶³r 0q93aoiSTART_this_is_to_be_modified_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART_this_also_needs_modification_ENDqa 032/a237(°1Q"§ >A_this_
START changeme ENDnot_this_modias

$ sed -f script file
aomodi3hriq32| ¶³r 0q93aoiSTARTi5_to_be_MODIfied_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART4l5o_need5_MODIfic4tion_ENDqa 032/a237(°1Q"§ >A_this_
START ch4ngeme ENDnot_this_modias
Source Link
Kusalananda ♦
Kusalananda ♦
  • 356.2k
  • 42
  • 737
  • 1.1k

Using standard sed and assuming every line contains exactly one START and one END substring (in that order):

# Save the original line in the hold space.
h

# Remove the start and the end from the line.
# This leaves the bit of the line that we want to modify.
s/.*START//
s/END.*//

# Modify what's left.
s/_this_//
s/modi/MODI/
y/as/45/

# Append the original line from the hold space,
# with a newline as delimiter.
G

# Move the modified bit into the correct spot with a substitution,
# while deleting the old substring between START and END.
s/\(.*\)\n\(.*START\).*\(END.*\)/\2\1\3/

Testing:

$ cat file
aomodi3hriq32| ¶³r 0q93aoiSTART_this_is_to_be_modified_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART_this_also_needs_modification_ENDqa 032/a237(°1Q"§ >A_this_
START changeme ENDnot_this_modias

$ sed -f script file
aomodi3hriq32| ¶³r 0q93aoiSTARTi5_to_be_MODIfied_ENDaqsdofuha23uru| ²23i ii3uhfia
oawpo3<9"§ A hSTART4l5o_need5_MODIfic4tion_ENDqa 032/a237(°1Q"§ >A_this_
START ch4ngeme ENDnot_this_modias