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We collected a bunch of shell scripting skills, I said, I write a blog mainly to make some study notes, to facilitate their access to, so I would come up with such an article, there is no incomprehensible. About the origin of these skills, eh, I forgot, it may come from theunixschool, commandlinefu, cool ground […] Text Interval: ——– # Add a blank line after each line sed G # The original delete all blank lines and add a blank line after each line. # So that each line of text output later and only a blank line. sed ‘/ ^ $ / d; G’ # […] Bash Reference Sheet Contents Bash Reference Sheet Syntax Basic Structures Compound Commands Command Lists Expressions Loops Builtins Dummies Declarative Input Output Execution Jobs/Processes Conditionals And Loops Script Arguments Streams File Descriptors Redirection Piping Expansions Common Combinations Tests Exit Codes Testing The Exit Code Patterns Glob Syntax Testing Parameters Special Parameters Parameter Operations Arrays Creating Arrays […] grep grep is a saviour command for unix users. grep can be used to search for patterns in a file or standard input. The pattern search includes finding the line number of the keyword, counting the number of occurrences of a keyword and many more. we will see in the following examples. Example 1) grep […] It seems like an esoteric concept, but it’s actually very useful. If your input file is “1 apple steve@example.com”, then your script could say: while read qty product customer do echo “${customer} wants ${qty} ${product}(s)” done The read command will read in the three variables, because they’re spaced out from each other. However, critical data […] [gview file=”http://rmohan.com/wp-content/uploads/2014/08/awk.cheat_.sheet_.pdf”]
[gview file=”http://rmohan.com/wp-content/uploads/2014/08/bash-history-cheat-sheet.pdf”] [gview file=”http://rmohan.com/wp-content/uploads/2014/08/bash-vi-editing-mode-cheat-sheet.pdf”] [gview file=”http://rmohan.com/wp-content/uploads/2014/08/perl.predefined.variables.pdf”] [gview file=”http://rmohan.com/wp-content/uploads/2014/08/sed.stream.editor.cheat_.sheet_.pdf”] .———————————————————————–. | | | AWK Cheat Sheet | | | ‘———————————————————————–‘ | Peteris Krumins (peter@catonmat.net), 2007.08.22 | | http://www.catonmat.net – good coders code, great reuse | ‘———————————————————————–‘ ===================== Predefined Variable Summary ===================== .————-+———————————–.———————. | | | Support: | | Variable | Description ‘—–.——-.——-‘ | | | AWK | NAWK | GAWK | ‘————-+———————————–+—–+——-+——-‘ | FS […] awk examples cat 03092608.LOG|grep XYZ|awk -F”.” ‘{print $2}’ |sort|awk ‘{tot += 1 } $1 != prev {print prev,tot;tot=0;prev=$1}END{print prev,tot;tot=0;prev=$1}’ adhocs 1. find_processes_using_ipcs.ksh
ipcs -bop|grep `whoami`|awk ‘{print $10}’|egrep -v “^0|^$”|sort -u|awk ‘{print “ps -ef|grep “, $1}’|ksh 2. iostat iostat -xn 4 30 3. jmap jmap -heap:format=b <pid> 4. monitorMemLeaking if [ $# […] # put your JAVA_HOME here, JAVA_HOME=/opt/javavm PID=$1 IFS=” top_number=10 if[ $# -gt 1 ] ; then top_number=$2 fi top_number=$((top_number+1)) java_stack=`$JAVA_HOME/bin/jstack $PID` top=`top -s -b -H -p $PID -n 1 | grep -vE ‘^top|^Tasks|^Cpu|^Mem|^Swap|^$’ | awk ‘NR==1; NR > 1 {print $0 | “sort -nrk 9”}’ | head -$top_number` echo $top echo $top |while read […] # put your JAVA_HOME here, JAVA_HOME=/opt/javavm PID=$1 IFS=” top_number=10 if[ $# -gt 1 ] ; then top_number=$2 fi top_number=$((top_number+1)) java_stack=`$JAVA_HOME/bin/jstack $PID` top=`top -s -b -H -p $PID -n 1 | grep -vE ‘^top|^Tasks|^Cpu|^Mem|^Swap|^$’ | awk ‘NR==1; NR > 1 {print $0 | “sort -nrk 9”}’ | head -$top_number` echo $top echo $top |while read […] |
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