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Full Discussion: How does egrep work?
Top Forums Shell Programming and Scripting How does egrep work? Post 302768399 by MadeInGermany on Friday 8th of February 2013 01:07:21 PM
Old 02-08-2013
The "|" in egrep is an "or".
It problably make more sense to convert to
Code:
ssh remote_machine df -h | awk 'NR==1 {header=$0 RS} $5~/[7-9][0-9]%|100%/ {print header $0; header=""}'

awk takes the same ERE as egrep, namely "[7-9][0-9]%|100%" but this operates on $5=column#5 only.
The main advantage is that it only prints the header (from NR=line#1) if needed.
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PR(1)							      General Commands Manual							     PR(1)

NAME
pr - print file SYNOPSIS
pr [ option ] ... [ file ] ... DESCRIPTION
Pr produces a printed listing of one or more files. The output is separated into pages headed by a date, the name of the file or a speci- fied header, and the page number. If there are no file arguments, pr prints its standard input. Options apply to all following files but may be reset between files: -n Produce n-column output. +n Begin printing with page n. -h Take the next argument as a page header. -wn For purposes of multi-column output, take the width of the page to be n characters instead of the default 72. -ln Take the length of the page to be n lines instead of the default 66. -t Do not print the 5-line header or the 5-line trailer normally supplied for each page. -sc Separate columns by the single character c instead of by the appropriate amount of white space. A missing c is taken to be a tab. -m Print all files simultaneously, each in one column, Inter-terminal messages via write(1) are forbidden during a pr. FILES
/dev/tty? to suspend messages. SEE ALSO
cat(1) DIAGNOSTICS
There are no diagnostics when pr is printing on a terminal. PR(1)
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