Top Forums Shell Programming and Scripting How do we display specific row of an output from bottom given line number? Post 303043986 by mohtashims on Wednesday 12th of February 2020 06:33:45 AM
How do we display specific row of an output from bottom given line number?

I pass a number to my script. Passing "1" below.

Code:
./getfile.sh 1
echo "User entered: $1"
 ls -ltr *.conf | sed -n '$p'

I wish to use ls -ltr i.e list files in ascending order of time the latest showing at the bottom of the output.

Number 1 should get me the last row of ls -ltr output i.e the latest file.
Passing Number "2" should get me the second last row of the output.
Number "3 would get me the 3rd last row and so forth.

I wish to use only sed for this purpose as it is works smoothy across different flavors of Operating Systems that I have.

ls -ltr | sed -n '$p' gives me the last row whereas ls -ltr | sed -n 3p gives me the third row from top.

I'm not sure how can I give an equation so that based on user input, I could get my sed to display corresponding row of output.
 
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Xmark(1)						      General Commands Manual							  Xmark(1)

NAME
Xmark - summarize x11perf results SYNTAX
Xmark datafile DESCRIPTION
Xmark is a shell script that reads the indicated datafile and compiles a benchmark which it writes to standard output. It writes three numbers: A weighted performance number for the x11perf results. A weighted performance number for a standard SparcStation 1, with SunOS 4.1.2, X11R5 Xsun, and a CG3 dumb Color Frame Buffer. The Xmark, which is the ratio of the two numbers above. The datafile must be an ordinary file, produced by x11perf in the following way: x11perf -display display -v1.3 -rop GXcopy GXxor -all > datafile It is possible to run the GXcopy and GXxor tests separately, as long as they are concatenated to the same output file: x11perf -display display -v1.3 -rop GXcopy -all > datafile x11perf -display display -v1.3 -rop GXxor -all >> datafile or x11perf -display display -v1.3 -rop GXxor -all > datafile x11perf -display display -v1.3 -rop GXcopy -all >> datafile FILES
temp.$$ Temporary file created in the current directory, deleted after use. DIAGNOSTICS
Usage: Xmark datafile Xmark was invoked without arguments or with more than one argument, or with options. Xmark takes no options. Error: data file does not exist or is not ordinary. Xmark cannot find the datafile named on its command line, or the datafile is a special file such as a directory. WARNING: datafile contains nnn, not 441 or 447 'trep' results; The file named on the command line does not seem to be a file generated by x11perf in the expected way. Diagnostic: ERROR: sum of weights =nnn, not equal to 4566.0; There is an internal error in Xmark. SEE ALSO
X(7), x11perf(1), x11perfcomp(1) X Version 11 x11perf 1.5 Xmark(1)

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