Please take a look at the sample file and the desired output below to understand what I am looking for.
It can be done with loops in a shell script but I am struggling to get an awk
/sed
one liner.
SampleFile.txt
These are leaves.
These are branches.
These are greenery which gives
oxygen, provides control over temperature
and maintains cleans the air.
These are tigers
These are bears
and deer and squirrels and other animals.
These are something you want to kill
Which will see you killed in the end.
These are things you must to think to save your tomorrow.
Desired output
These are leaves.
These are branches.
These are greenery which gives oxygen, provides control over temperature and maintains cleans the air.
These are tigers
These are bears and deer and squirrels and other animals.
These are something you want to kill Which will see you killed in the end.
These are things you must to think to save your tomorrow.
The ^ character is what instructs the sed command to add a character to the beginning of each line. Here's the syntax for adding a space to the beginning of each line using sed . Alternatively, use the -i option with the sed command to edit a file in place.
The first line of a file can be skipped by using various Linux commands. As shown in this tutorial, there are different ways to skip the first line of a file by using the `awk` command. Noteably, the NR variable of the `awk` command can be used to skip the first line of any file.
The cut command in UNIX is a command for cutting out the sections from each line of files and writing the result to standard output. It can be used to cut parts of a line by byte position, character and field. Basically the cut command slices a line and extracts the text.
The traditional way of using paste command with "-s" option. "-d" in paste can take multiple delimiters. The delimiters specified here are comma and a newline character. This means while joining the first and second line use comma, and the second and third line by a newline character.
With sed:
sed ':a;N;/\nThese/!s/\n/ /;ta;P;D' infile
resulting in
These are leaves.
These are branches.
These are greenery which gives oxygen, provides control over temperature and maintains cleans the air.
These are tigers
These are bears and deer and squirrels and other animals.
These are something you want to kill Which will see you killed in the end.
These are things you must to think to save your tomorrow.
Here is how it works:
sed '
:a # Label to jump to
N # Append next line to pattern space
/\nThese/!s/\n/ / # If the newline is NOT followed by "These", append
# the line by replacing the newline with a space
ta # If we changed something, jump to label
P # Print part until newline
D # Delete part until newline
' infile
The N;P;D
is the idiomatic way of keeping multiple lines in the pattern space; the conditional branching part takes care of the situation where we append more than one line.
This works with GNU sed; for other seds like the one found in Mac OS, the oneliner has to be split up so branching and label are in separate commands, the newlines may have to be escaped, and we need an extra semicolon:
sed -e ':a' -e 'N;/'$'\n''These/!s/'$'\n''/ /;ta' -e 'P;D;' infile
This last command is untested; see this answer for differences between different seds and how to handle them.
Another alternative is to enter the newlines literally:
sed -e ':a' -e 'N;/\
These/!s/\
/ /;ta' -e 'P;D;' infile
But then, by definition, it's no longer a one-liner.
Please try the following:
awk 'BEGIN {accum_line = "";} /^These/{if(length(accum_line)){print accum_line; accum_line = "";}} {accum_line = accum_line " " $0;} END {if(length(accum_line)){print accum_line; }}' < data.txt
The code consists of three parts:
These
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