How to add core GNU commands to a pre-existing AIX system

You are missing a semicolon after the p before the `}'

sed -n '/pattern/{N;p;}' ouputfile.txt

You could also write it stringed as multiple -e commands:

sed -n -e '/pattern/{' -e 'N;p' -e '}' ouputfile.txt

And the safest & clearest way is to lay it out across lines as this method affords you to place in-line comments in the sed code:

sed -ne '
    # lines matching pattern
    /pattern/{
        N;      # grab the next line into the pattern space
        p;      # print the pattern space holding the current+next line
    }
' outputfile.txt

(don't forget the ; in between the N/p and # commands)

I want 4 processes at a time, each process should process 1 record

parallel -j4 -k --no-notice 'echo "{}"' ::: {1..10}

• -j4 - number of jobslots. Run up to 4 jobs in parallel

• -k - keep sequence of output same as the order of input. Normally the output of a job will be printed as soon as the job completes

• ::: - arguments

The output:

1
2
3
4
5
6
7
8
9
10