4 Command Content Error
Contents |
In submit Tutorials Questions Projects Meetups Main Site logo-horizontal DigitalOcean Community Menu Tutorials Questions Projects Meetups Main Site Sign Up Log In input output redirection in linux submit View All Results Subscribe Subscribed Share Contents Contents We hope you input output redirection in unix find this tutorial helpful. In addition to guides like this one, we provide simple cloud infrastructure for which of the following linux directories contains commands that can only be used by the root user? developers. Learn more → 18 An Introduction to Linux I/O Redirection Posted Jan 23, 2014 74.1k views Linux Basics Tutorial Series This tutorial is part 4 of 4 in the
Linux Redirection Operators
series: Getting Started with Linux Getting Started with Linux If you are new to Linux and its command line interface, it may seem like a daunting task to get started with it. This series will bring you up to speed with essential Linux basics, and provide a solid foundation for working with Linux servers. If you have little to the echo command: no knowledge about using Linux, this is where you will want to start. An Introduction to the Linux Terminal November 7, 2014 Basic Linux Navigation and File Management November 7, 2014 An Introduction to Linux Permissions November 14, 2014 An Introduction to Linux I/O Redirection January 23, 2014 Previous Tutorial Introduction The redirection capabilities built into Linux provide you with a robust set of tools used to make all sorts of tasks easier to accomplish. Whether you're writing complex software or performing file management through the command line, knowing how to manipulate the different I/O streams in your environment will greatly increase your productivity. Streams Input and output in the Linux environment is distributed across three streams. These streams are: standard input (stdin) standard output (stdout) standard error (stderr) The streams are also numbered: stdin (0) stdout (1) stderr (2) During standard interactions between the user and the terminal, standard input is transmitted through the user's keyboard. Standard output and standard error are displayed on the user's terminal as text. Collectively, the three streams are
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring a file begins with #!/bin/csh. this means: developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question
Linux Tee
_ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them;
2>&1
it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Capture screen content for error parsing up vote 3 down https://www.digitalocean.com/community/tutorials/an-introduction-to-linux-i-o-redirection vote favorite I am a database administrator working with DB2 on AIX. (Please continue to read as this is related more to ksh than DB2, otherwise I would have posted this over on dba.stackexchange.com.) I am attempting to write up ksh scripts for several of our database deployment as well as database maintenance scripts. I am in the process of putting error handling in our scripts to know whether or not something requires a hard fail or just a warning message, http://unix.stackexchange.com/questions/59602/capture-screen-content-for-error-parsing or can be ignored. With most AIX/ksh related tasks I can check $? = 0, but not so with DB2. Unless the database engine fails, I will never get anything but a zero. DB2 will, however, pass back to the console its error/warning/info codes. Since I know I can get at those codes via the console, I have been trying to capture whatever is on the console for specific command to DB2. Once I have that, I have been sending that output to a function where I use egrep and regular expressions to determine if I need to fail (exit 1), or succeed (exit 0) within my script. I also tend to pipe all output from my script to tee, since several of my scripts are long and/or call into multiple other scripts. This way I have a record of the entire "job" that ran both for reference, as well as for troubleshooting my scripts. Recently, I learned I can ksh blah.sh 2 > &1 | tee mylog in order to make sure I capture syntax errors with my script. I am wondering, what is the best way to handling this kind of error parsing in ksh? I have tried to feed a command to DB2 with the -v option (which is supposed to play the command back to the screen as well as the results of the command) and put that in a variable, but then I actually
greater than 0 (Currently there is only one success code: 1) Failure return code less than 0 Notes: http://wiki.imacros.net/Error_and_Return_Codes The code is sent via the Scripting Interface or command line interface. You can use this return code to find out whether a macro succeeded or not. With https://getfirebug.com/wiki/index.php/Console_Panel iimGetLastError() the text of an error message can be retrieved via the Scripting Interface. These error codes should not be confused with the Scripting Interface Return Codes which input output are between -1 and -100. Contents 1 User interaction 2 Macro Playback 3 Firefox Error Codes 4 Chrome Error Codes 5 Scripting Interface Return Codes User interaction Code Reason -101 Aborted: User pressed the Stop button in the iMacros sidebar. Typically, you can check this value to see if the user wants to exit the application. -102 input output redirection Browser Closed: User pressed the Window Close button in the browser. This code does not apply when using the built-in Javascript scripting interface in Firefox. Macro Playback iMacros error codes are in the range between -1000 and -2000. Code Reason -1000 Unspecified: Macro playback returned an error without explicitly specifying an error code. -1010 Not In Playback Mode: Error occurred while macro playback is not active (recording or idle mode). -1020 Unsupported Browser: Unsupported web browser was specified for the macro playback engine. -1030 Browser Not Initialized: Browser type not yet determined. -1040 Tabbed Browsing Disabled: Attempt to run the TAB command while IE tabbed browsing is disabled. -1100 Load Failed: Failed to load the macro (syntax or I/O error) (Found wrong macro command while loading file). -1110 Invalid Macro Name: Invalid macro name specified for playback (Command Line Error: No Macro found). -1200 Bad Parameter: Invalid macro parameter was specified. -1210 Cannot Compile Regex: Cannot compile regular expression (as in SEARCH). -1220 Wrong Decryption Password: Inco
2.1 Break On All Errors 2.2 Clear 2.3 Persist 2.4 Profile 2.5 Filter buttons 3 Command Line 3.1 Command Editor 3.2 Smart paste 4 Console 4.1 JavaScript values 4.2 Click functionality 4.3 Profiling 4.4 Performance timing 5 See also Options Menu[edit] This menu is reachable via the little arrow in the panel tab ( ) or by right-clicking on on the panel tab (since Firebug 1.9). Option Preference Description Enabled extensions.firebug.console.enableSites Enables the Console Panel Show JavaScript Errors extensions.firebug.showJSErrors Toggles logging of JavaScript error messages into the console Show JavaScript Warnings extensions.firebug.showJSWarnings Toggles logging of JavaScript warning messages into the console Show CSS Errors extensions.firebug.showCSSErrors Toggles logging of CSS error messages into the console Show XML/HTML Errors extensions.firebug.showXMLErrors Toggles logging of XML and HTML error messages into the console Show XMLHttpRequests extensions.firebug.showXMLHttpRequests Toggles logging of XMLHttpRequests into the console; see the Net Panel for more info Show Chrome Errors extensions.firebug.showChromeErrors Toggles logging of program and add-on internal error messages into the console Show Chrome Messages extensions.firebug.showChromeMessages Toggles logging of program and add-on internal messages into the console Show External Errors extensions.firebug.showExternalErrors Toggles logging of external error messages into the console Show Network Errors extensions.firebug.showNetworkErrors Toggles logging of network error messages into the console Show Stack Trace With Errors extensions.firebug.service.showStackTrace Toggles the inclusion of the stack trace for error messages Show Cookie Events extensions.firebug.cookies.logEvents Toggles logging of cookie events into the console; see the Cookies Panel for more info Strict Warnings (performance penalty) javascript.options.strict Toggles logging of strict warnings into the console Group Log Messages extensions.firebug.console.groupLogMessages Controls whether equal log messages are grouped Command Editor extensions.firebug.commandEditor Toggles between the Command Line and the Command Editor Show Completion List Popup extensions.firebug.commandLineShowCompleterPopup Toggles the auto-completion of commands while typing For