Print Line above and line below


 
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Old 09-21-2011
How about plain old ex...this will print 4 lines above/below "ERROR"...
Code:
ex -s +'/ERROR/-4,/ERROR/+4 p | q!' file

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HTTEST(1)							   User Commands							 HTTEST(1)

NAME
httest - test HTTP driven application SYNOPSIS
httest [OPTIONS] scripts DESCRIPTION
httest is a script based tool for testing and benchmarking web applications, web servers, proxy servers and web browsers. httest can emu- late clients and servers in the same test script, very useful for testing proxys. OPTIONS
-V --version Print version number and exit -h --help Display usage information (this message) -n --suppress do no print start and OK|FAILED -s --silent silent mode -e --error log level error -w --warn log level warn -i --info log level info -d --debug log level debug for script debugging -p --debug-system log level debug-system to log more details -L --list-commands List all available script commands -C --help-command Print help for specific command -t --duration Print test duration -T --timestamp Time stamp on every run -S --shell Shell mode -S --shell Shell mode -D --define Define variables EXAMPLES
httest script.htt httest -Ts script.htt SCRIPTS
httest is script based. The following script examples can be but into a scripte i.e. sample.htt and can be called like httest sample.htt SIMPLE SCRIPT
Get a page and do expect return code 200 OK. CLIENT _REQ www.google.ch 80 __GET /search?q=apache HTTP/1.1 __Host: www.google.ch __ _EXPECT headers "HTTP/1.1 200 OK" _WAIT END CUT AND PAST SCRIPT
Cut and past from a HTTP stream, i.e we cut the apache host to access it in the second request. CLIENT _REQ www.google.ch 80 __GET /search?q=apache HTTP/1.1 __Host: www.google.ch __ _MATCH body '<a href="http://([^/]*)/" class=l>Welcome! - The <em>Apache</em> HTTP Server Project' APACHE_HOST _WAIT _REQ $APACHE_HOST 80 __GET / HTTP/1.1 __Host: $APACHE_HOST __ _WAIT END CLIENT SERVER SCRIPT
We can hold client and server in the same host. Actually multiple client and multiple server. Very useful to test forward or reverse prox- ies. Or a webapplication which communicat itself with third party servers i.e. mail server. This is a very basic selfcontained test you can run on any maschine. CLIENT _REQ localhost 8080 __GET /foo HTTP/1.1 __Host: localhost __ _WAIT END SERVER 8080 _RES _EXPECT "/foo" _WAIT __HTTP/1.1 200 OK __Content-Length: AUTO __ __Hello World END SSL SCRIPT
Of course SSL do also work with httest, just put "SSL:" before port. CLIENT _REQ localhost SSL:8080 __GET /foo HTTP/1.1 __Host: localhost __ _WAIT END SERVER SSL:8080 _RES _EXPECT "/foo" _WAIT __HTTP/1.1 200 OK __Content-Length: AUTO __ __Hello World END AUTHOR
Written by Christian Liesch REPORTING BUGS
Report bugs to http://sourceforge.net/projects/htt COPYRIGHT
Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. httest 2.2.6 June 2012 HTTEST(1)