AWK can do this in a simple way: awk ' to the start of the AWK expression. If I understand your question correctly you do want the lines after TERMINATE, not including the TERMINATE-line. They will also look like variables to be expanded, so you have to escape those $ characters with a backslash like: \$p, \$d, \$w. The sed ranges also contain a $ and are immediately followed by a letter like: $p, $d, $w.So, you have to change all the single quotes to double quotes if they contain text you want to replace with a variable. Variables ( $variablename) enclosed in single quotes won't "expand" but variables inside double quotes will.The important points about replacing text with variables in these cases are: # (from line-1 to BEFORE the matching line, NOT including the matching line) # Print all the lines before the line containing the matching text: # (from AFTER the matching line to EOF, NOT including the matching line) # matching text, till the end of the file: # Print from the line that follows the line containing the egrep 'pattern1pattern2' fileNameorfilePath Another option is to add multiple separate patterns to the grep command. grep -E 'pattern1pattern2' fileNameorfilePath The deprecated version of extended grep is egrep. This option treats the pattern you used as an extended regular expression. # (from the matching line to EOF, including the matching line) The latest way to use grep is with the -E option. To use a variable for the matching text with the previous examples: # Print the line containing the matching text, till the end of the file: You would make a variable for the matching text and then do it the same way as the previous example: matchtext=TERMINATE How would you replace the hardcoded TERMINATE by a variable? I forgot to tell that the new line is important after the filenames in the script so that sed knows that the filenames end.
GRAB GREP PATTERN AFTER A SYMBOL CODE
IF you do not want to hard code the filenames in the sed script, you can: before=before.txtīut then you have to escape the $ meaning the last line so the shell will not try to expand the $w variable (note that we now use double quotes around the script instead of single quotes). The before and after files will contain the line with terminate, so to process each you need to use: head -n -1 before If you want the lines before TERMINATE: sed -e '/TERMINATE/,$d'Īnd if you want both lines before and after TERMINATE in two different files in a single pass: sed -e '1,/TERMINATE/w before As sed default behavior is to print the lines, it will print the lines after TERMINATE to the end of input. (from AFTER the matching line to EOF, NOT including the matching line) sed -e '1,/TERMINATE/d'Įxplained: 1,/TERMINATE/ is an address (line) range selection meaning the first line for the input to the 1st line matching the TERMINATE regular expression, and d is the delete command which delete the current line and skip to the next line. This will print from the line that follows the line matching TERMINATE till the end of the file: If the second and third match to -c were within the context number of lines, though, this output may not be what you want.The following will print the line matching TERMINATE till the end of the file: sed -n -e '/TERMINATE/,$p'Įxplained: -n disables default behavior of sed of printing each line after executing its script on it, -e indicated a script to sed, /TERMINATE/,$ is an address (line) range selection meaning the first line matching the TERMINATE regular expression (like grep) to the end of the file ( $), and p is the print command which prints the current line. tail -n4 returns the last four lines from among those matches. The -m3 option tells grep to return only the first three matches. If f is nonzero, then print the line and decrement f.Īlternative solution $ man sh | grep -A3 -m3 -c | tail -n4 If we reach a line containing -c, then increment the count n by one. f keeps track of how many lines we are supposed to print. n keeps track of how many times we have seen -c. Set from the remaining argument operands.Īwk implicitly reads its input line by line. Special param‐Įter 0 will be set from the command_name operand and the positional parameters ($1, $2, etc.) c Read commands from the command_string operand instead of from the standard input. To get the third occurrence of -c with three lines of context: $ man sh | awk '/-c/' The occurrence that you want is not the second occurrence it is the third.
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