Your grep is probably removing ls‘s color codes because it has its own coloring turned on. You “could” do this: ls -l –color=always | grep –color=never pattern However, it is very important that you understand what exactly you’re grepping here. Not only is grepping ls unnecessary (use a glob instead), this particular case is grepping … Read more
It’s not the quotes : try this : grep -Ri — ‘->someFunction’ . the — part stands for end of options ; it’s a shell trick.
You need to use awk: awk ‘{print $1,$3}’ <namefile> This simple command allows printing the first ($1) and third ($3) column of the file. The software awk is actually much more powerful. I think you should have a look at the man page of awk. A nice combo is using grep and awk with a … Read more
$ grep -Pio ‘(?<=heads\/)(.*?)(?=\n)’ text.txt # P option instead of E If you use GNU grep, you can use -P or –perl-regexp options. In case you are using OS X, you need to install GNU grep. $ brew install grep Due to recent changes, to use GNU grep on macOS you either have to prepend … Read more
cat /etc/passwd -n | grep `whoami` | cut -f1 Surrounding a command in ` marks makes it execute the command and send the output into the command it’s wrapped in.
I believe the problem here is that the first grep is buffering the output which means the second grep won’t see it until the buffer is flushed. Try adding the –line-buffered option on your first grep: tail -f access_log | grep –line-buffered “127.0.0.1” | grep -v “.css” For more info, see “BashFAQ/009 — What is … Read more
You can tail it, then grep: tail -n +50000 myfile.txt | grep -in “time spent”
The following means you only need type the command once (rather than using && and typing it twice), it’s also quite simple to understand. some-command | { head -1; grep some-stuff; } e.g. ps -ef | { head -1; grep python; } UPDATE: This only seems to work for ps, sorry, but I guess this … Read more
According to the man page of ag -G –file-search-regex PATTERN Only search files whose names match PATTERN. You can use the -G option to perform searches on files matching a pattern. So, to answer your question: root@apache107:~/rpm-4.12.0.1# ag -G cpio.c size rpm2cpio.c 21: off_t payload_size; 73: /* Retrieve payload size and compression type. */ 76: … Read more
You can use zgrep. Usage is similar to grep. zgrep “pattern” file.gz From the man page’s description: Zgrep invokes grep on compressed or gzipped files. All options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are … Read more