Now awk and sed are completly different than grep. awk and sed are text processors. Not only do they have the ability to find what you are looking for in text, they have the ability to remove, add and modify the text as well (and much more). awk is mostly used for data extraction and reporting. sed is a stream editor

2014年9月8日 · First, there are two unrelated things in the list "Perl, Python awk and sed". Thing 1 - simplistic text manipulation tools. sed. It has a fixed, relatively simple scope of work defined by the idea of reading and examining each line of a file. sed is not designed to …

2011年5月30日 · You can use find and -exec directly into sed rather than first locating oldstr with grep. It's maybe a bit less efficient, but that might not be important. This way, the sed replacement is executed over all files listed by find, but if oldstr isn't there it obviously won't operate on it. find /path -type f -exec sed -i 's/oldstr/newstr/g' {} \;

2) What kind of application are best use cases for sed and awk tools ? Conclusion: Use sed for very simple text parsing. Anything beyond that, awk is better. In fact, you can ditch sed altogether and just use awk. Since their functions overlap and awk can do more, just use awk. You will reduce your learning curve as well.

2010年12月21日 · GNU Grep has many more capabilities than the traditional or POSIX versions of Grep. sed is for modifying the contents of files using editing commands, including regular expressions. The GNU Sed has many more capabilities than the traditional or POSIX versions of Sed. awk is a pattern matching and formatting language. It is a programming ...

2009年7月23日 · Honestly, much as I love sed for appropriate tasks, this is definitely a task for perl -- it's truly more powerful for this kind of one-liners, especially to "write it back to where it comes from" (perl's -i switch does it for you, and optionally also lets you keep the old version around e.g. with a .bak appended, just use -i.bak instead).

2015年5月5日 · The egrep command is a shortcut for the grep binary, but with one exception: when grep is invoked as egrep, the grep binary activates its internal logic to run as if it were called as grep -E. The difference is that -E option enables usage of extended regexp patterns.

GNU sed's -r option only changes the escaping rules, according to Appendix A Extended regular expressions of the info file and some quick tests; it doesn't actually add a non-greedy qualifier (as of GNU sed version 4.2.1 at least.)

2014年11月21日 · On the other hand, awk and sed can perfectly do it because they are like a Swiss Army knife, but this is not supposed to be its best "skill" over the multiple others that they have. In Efficient way to print lines from a massive file using awk, sed, or something else? there is a nice comparison on methods and head / tail is seen as the best ...

2013年3月6日 · The contents of "input.txt" are fed into the Sed command, the output of which is then fed into the grep command, and so on. The final output is obviously printed into a new file named "output.txt". And yes, like jeb mentioned, this looks like an awkward solution, because everything here can be done sed alone, presumably by only one or two commands.