If I use the grep command for parsing files, does it stop parsing right after it finds the matching pattern or does it continue to parse that document?
Most implementations of the awk utility will stop reading the current file when a match is found when the -l is given on the command line. (There is no requirement that grep quit reading the file when a match is found, but it is more efficient if it is done that way and most implementations of grep try to be efficient.) Note also that if the data being read is from standard input rather than from a path operand given on the command line, that might be treated differently.
This User Gave Thanks to Don Cragun For This Post:
hey peeps
ive made my first script, its for my work made in HP-UX, kshell
anyways
the script copies 3 files from a spider system to the floppydrive of my collegeau, I want to check if there is a floppy in the drive otherwise the script just runs forever and I don't have that time a day... (1 Reply)
Basic:
find . -type f -name “*.txt” -print | awk '{gsub("Ontem", "AntesdeOntem", $0); print > FILENAME}' *.txt
The idea is in folder /home/myapontamentos
I have some files and i need to change in all them the word "ontem" to "antesdeontem".
But bigger files are cut (size i mean)... (4 Replies)
I have the following code. I want to remove the --sort=num/num/... and am
using grep to exclude it as shown below:
I have a bit of problem figuring out the use of - at the front
echo "--sort=4/5/6" | grep -ivE '-((sort|group)=+/+(/+)*)$'
Now suppose I want to remove --quiet
I can... (7 Replies)
I have the following line of code that works wonders. I just don't completely understand it as I am just starting to learn regex. Can you help me understand exactly what is happening here?
find . -type f | grep -v '^\.$' | sed 's!\.\/!!' (4 Replies)
i have this line of code that looks for the same file if it is currently running and returns the count.
`ps -eaf -o args | grep -i sfs_pcard_load_file.ksh | grep -v grep | wc -l`
basically it is assigned to a variable
ISRUNNING=`ps -eaf -o args | grep -i sfs_pcard_load_file.ksh |... (6 Replies)
I have seen this code in a few places and my understanding is they are using it to determine what app called the script.
I have a script that is called by two different applications and what it to do one thing when called by one and something else when called by the other. How do I determine... (1 Reply)
Discussion started by: croyleje
1 Replies
LEARN ABOUT PLAN9
grep
GREP(1) General Commands Manual GREP(1)NAME
grep - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as
defined in regexp(6). Normally, each line matching the pattern is `selected', and each selected line is copied to the standard output.
The options are
-c Print only a count of matching lines.
-h Do not print file name tags (headers) with output lines.
-i Ignore alphabetic case distinctions. The implementation folds into lower case all letters in the pattern and input before interpre-
tation. Matched lines are printed in their original form.
-l (ell) Print the names of files with selected lines; don't print the lines.
-L Print the names of files with no selected lines; the converse of -l.
-n Mark each printed line with its line number counted in its file.
-s Produce no output, but return status.
-v Reverse: print lines that do not match the pattern.
Output lines are tagged by file name when there is more than one input file. (To force this tagging, include /dev/null as a file name
argument.)
Care should be taken when using the shell metacharacters $*[^|()= and newline in pattern; it is safest to enclose the entire expression in
single quotes '...'.
SOURCE
/sys/src/cmd/grep.c
SEE ALSO ed(1), awk(1), sed(1), sam(1), regexp(6)DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)