This is the command that works: tail -f my_file.log | grep "X" By redirecting the output of this first grep command to /dev/null we prevent the lines from being printed at this time. But to a temporary and quick need, this script solve the problem: if ps -fu oracle | grep -v grep | grep ora_smon_orcl >/dev/null then echo "orcl instance is up and running" else echo "orcl instance is down" sqlplus /nolog > /dev/null 2>&1 < cron.log -- exporting the contents to a file cat cron.log|grep something-- need some commands to grep that info You are missing the point. I know for a fact that there are more than 60 occurrences of the word address in the log file. On the other side Windows operating systems generally lacks this tool and its functionality up to Powershell. Even if I used ‘cat’ first and then tried to grep that output grep would return no results. You canuse Select-String similar to grep in UNIX or findstr.exe in Windows.Select-String is based on lines of text. This makes your log analysis more accurate because it will ignore undesired matches from other parts of the log message. Matheus. In most situations/directories you won’t need the parameter “-type f” For case insensitive search just apply the parameter -i. Grep is a powerful utility available by default on UNIX-based systems. This forum is for discussion of SQL and PL/SQL questions. For instance, the following command line displays lines 45 to 75 from the netlogon.log file. You should see a lot of stuff either way- the same stuff. I did do a: grep -i access.log. The Select-String cmdlet searches for text and text patterns in input strings and files. I believe your 'awk' command is spurious- the grep -c will do the counting for you- but anyway the script and the command line should both behave the same. This script checks the alert log for the string ?ORA-? Turns out the version of grep on CentOS 5 (GNU grep 2.6.3) does not support UTF-16 which is what my PowerShell logs were encoded in. We will see how to pass these as arguments from the command line to the script. > bash grep_script.sh linux file server debian server fedora backup server Here in the script we have hardcoded the filename and the search pattern. But I still get 0. Search for content within files using regular grep find ./ -type f -exec grep -Hn "YourContent" {} \; 2. awk, bash, grep, java, sed, shell scripts. Here is another example. This shows you how you can search in files for specific content with Windows PowerShell. The grep tool is used to locates files by scanning their content.You can search a single file or a whole directory of files. For example, if we want to search the file bobs_file.txt for each occurence of the word bob, we can use the following command:. By default, Select-String finds the first match in eachline and, for each match, it displays the file name, line number, and all text in the linecontaining the match. How to grep logs for errors and receive specific additional lines? if in shell script If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvDestroyAllWindows' If your system is using EFI Secure Boot you may need to sign the kernel modules (vboxdrv, vboxnetflt, vboxnetadp, vboxpci) before you can load them. Tags. The syntax is: grep [OPTIONS] PATTERN FILE. If you switch from Linux to Windows, you might be … if [ $error.log -gt 0 ] then # yes error(s) found, let send an email echo "$AMESS" | email -s "$ASUB" $AEMAIL else # naa, everything looks okay echo "$OK_MESS" fi $ grep "authentication failure" /var/log/auth.log | cut -d '=' -f 8 root Filtering and Parsing With Awk. Hi, thanks for sharing the “grep” command string. Using PowerShell for a Typical Grep Task Let's say you've got a big string of containing various employee names and addresses. By redirecting the output of this first grep command to /dev/null we prevent the lines from being printed at this time. with the grep command. In the Unix bash shell script, what would be an example of searching within Unix directory for a file ("sasprog1.LOG") and then checking for an ERROR within "sasprog1.LOG" file and then opening another file ("file1.txt") and then writing some messages to "file1.txt" file? *Also note this about the 3rd or 4th thread on the same subject so please keep your topic in one place from now on, OK? For BSD or GNU grep, we can use -B option to set number of lines before the match and -A option to set number of lines after the match. Linux provides tool named grep for filter text data or output according to given string or regular expression. In this article, let us review how to effectively view and manipulate huge log files using 10 awesome examples. # Terminate our shell script with success message exit 1 fun() from above file grep exit: $ grep "exit" demo_file. Is there a way to scan a specific log file for errors that occurred in the last hour (time when script is run - 60 minutes)? For multiple possibilities, you could maybe drop the grep and instead use a case within the while. By using the grep command, you can customize how the tool searches for a pattern or multiple patterns in this case. So you can think of Select-String as PowerShell version of Grep. Instead shell script asks you, the author, to check individual program exit codes and branch as needed in case of an error. In the Unix/Linux world, you mostly use the command grep for doing the same. But I'd like to refine that script to be more useful. Either select files by providing them as argument to your script, by using a selector with say "getopts" (in BASH shell: 'help getopts') or use "select" (in BASH shell: 'help select'). Thus, if you spotted a specific line in the midst of log file, you can display only the context for this specific line by using the Get-Content cmdlet and piping the result to the Select-Object cmdlet associated with the First and Skip parameters. For instance, there’s no grep, and ls -al won’t work (but ls will and it’ll display all files with details!).. tail -F /path/to/serverLog | grep --line-buffered 'server is up' | while read ; do my_command ; done ...which will run my_command every time "server is up" appears in the log file. PowerShell is awesome if you haven’t used it but it’s absolutely foreign if you’re used to Unix-like Bash-like shells. This is the grep command I used grep -ic address log* The output is 0. This also 'replaces' the Windows command-line utility 'findstr'. To search all files in the current directory, use an asterisk instead of a … Syntax: $ sed -n -e Xp -e Yp FILENAME. That's working perfectly fine. View only the specific lines mentioned by line numbers. output: exit 1. Here is the script: Code: grep -n "SEVERE" /minecraft/server.log | awk -F":" ' {print $1-2 "," $1+10 "p"}' | xargs -t -i sed -n {} /minecraft/server.log >> /minecraft/severe_errors.log. Now I want to pipe this again into another grep, that will remove all the lines containing "Y". exit 1 fi # okay search for errors in file error.log=$(grep -c -i "ERROR" $FILE) # error found or not? I have a script that I've used to find errors in my Minecraft Server logs. Example 1: Display specific lines (based on line number) of a file using sed command. Then I'm piping this to grep, to find only lines that contain "X". This tool is popular amongst Linux system administrators. The Select-String cmdlet searches for text and text patterns in input strings and files. 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