The syntax of strip command is :. Before jumping on to the examples, here is the code behind the executable that we would be using in this article. Please note that the nm command that we mentioned in our Reverse Engineering Tools in Linux , cannot be used on an executable that is stripped using strip command. The above output indicates that the executable contains the following symbols initially. Now lets strip the symbol table using -s option and then again see the output :.
Now if we compare the above output with the non stripped output of the same file then we see that the debug information highlighted in bold has been stripped off :. The unneeded symbols that are not required for relocation processing can be stripped off using the —strip-unneeded option. Confirm this using the readelf command. In a scenario where all the symbols are needed to be stripped off except one, then this can be achieved by supplying the symbol name along with the -K option.
So we see that the symbol example. Please note that multiple -K options can be used in the same command. Note: I am not sure why some other symbols were also not stripped off along with example. Any type of knowledge and suggestions are welcome on this. In a scenario where only a particular symbol is to be stripped off, just supply the symbol name along with the -N option. By default the strip command replaces the existing executable or object file with the stripped off version of the same.
Sign up to join this community. The best answers are voted up and rise to the top. What are stripped and not-stripped executables in Unix? Ask Question. Asked 10 years, 4 months ago. Active 3 years, 6 months ago. Viewed 59k times. Why are some of the executables stripped while others are not? Improve this question. Gilles 'SO- stop being evil' k gold badges silver badges bronze badges. Lazer Lazer Add a comment. Active Oldest Votes. Improve this answer.
See also the strip 1 manpage. The concept generalizes to most executable formats, this isn't specific to gcc or even to unix. I had a 40MB executable that when stripped was reduced to 6MB - just so you get an idea of the kind of space that debugging data takes up. So, does stripping an executable prog. The assembly code stays the same whether or not the file is stripped.
You get an executable without the debugging info so you're right about the loss of "-g" and without all symbols that is, function names, global variable names It is the equivalent of "gcc -s -o prog.
When stripping symbols, keep symbol symbolname even if it would normally be stripped. The default is to attempt this reduction unless stripping debug or DWO information. Remove symbol symbolname from the source file. This option may be given more than once, and may be combined with strip options other than -K. Put the stripped output in file , rather than replacing the existing file.
When this argument is used, only one objfile argument may be specified. Operate in deterministic mode. When copying archive members and writing the archive index, use zero for UIDs, GIDs, timestamps, and use consistent file modes for all files. If binutils was configured with --enable-deterministic-archives , then this mode is on by default. Do not operate in deterministic mode. This is the inverse of the -D option, above: when copying archive members and writing the archive index, use their actual UID, GID, timestamp, and file mode values.
This is the default unless binutils was configured with --enable-deterministic-archives. Permit regular expressions in symbolname s used in other command line options. The question mark? If the first character of the symbol name is the exclamation point! Remove compiler-generated local symbols. When stripping a file, perhaps with --strip-debug or --strip-unneeded , retain any symbols specifying source file names, which would otherwise get stripped.
Strip a file, emptying the contents of any sections that would not be stripped by --strip-debug and leaving the debugging sections intact. In ELF files, this preserves all the note sections in the output as well. Note - the section headers of the stripped sections are preserved, including their sizes, but the contents of the section are discarded. The section headers are preserved so that other tools can match up the debuginfo file with the real executable, even if that executable has been relocated to a different address space.
The intention is that this option will be used in conjunction with --add-gnu-debuglink to create a two part executable. One a stripped binary which will occupy less space in RAM and in a distribution and the second a debugging information file which is only needed if debugging abilities are required. The suggested procedure to create these files is as follows:. By default the strip command replaces the existing executable or object file with the stripped off version of the same.
But, in case there is a requirement that the stripped file should not replace the original one then that can be done by supplying the name of the new file along with the -o option. Lets first check the access and modification time of the original file using stat command :. So the above output indicates that the strip command accepted the output from the file options. So we see that information on intermediate steps was produced in the output when strip command was asked to strip down three executables.
Notify me of followup comments via e-mail. All rights reserved Terms of Service. Jalal Hajigholamali September 6, , am. Hi, Very nice and useful article Thanks a lot. I will be posting instruction guides, how-to, troubleshooting tips and tricks on Linux, database, hardware, security and web. My focus is to write articles that will either teach you or help you resolve a problem. Read more about Ramesh Natarajan and the blog. Contact Us Email Me : Use this Contact Form to get in touch me with your comments, questions or suggestions about this site.
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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Could anyone please explain me whats the actual difference between a stripped and a non-stripped binary in Linux? After a little bit of googling, I found that non-stripped binary contains the debugging info and stripped binary does'nt.
Although you have found your answer from the Google. Just putting that , non-stripped binaries have debugging information built into it. So if you compile an executable with gcc's -g flag, it contains debugging information. Whereas Strip binaries generally remove this debugging information from the exe which is not necessary for execution so as to reduce the size of the exe. Learn more. Difference between a stripped binary and a non stripped binary in Linux Ask Question.
Asked 6 years, 10 months ago. Active 6 years, 10 months ago. Viewed 18k times. Improve this question. Droider Droider 2 2 gold badges 4 4 silver badges 13 13 bronze badges. It seems like you got your answer when you googled. What more do you need to know?
Barmar This is now the top answer on Google. Add a comment. Active Oldest Votes. Improve this answer. Rahul Tripathi Rahul Tripathi k 26 26 gold badges silver badges bronze badges. Thank you for your response. Asked 8 years, 2 months ago. Active 8 years, 2 months ago. Viewed 4k times. I have everything setup in the directory tree where I want them to end up and a DEBIAN folder with the control file and then do fakeroot dpkg-deb --build.
Any ideas or suggestions? Improve this question. Jaime Jaime 1 1 silver badge 4 4 bronze badges. Add a comment. Active Oldest Votes. For strip a common use is to only strip the debugging symbols: strip -S -o [stripped-file] [input-file] The switch corresponding to strip -S for is objcopy -g or simply use the long form that works for both but not on all platforms on which I had to use strip : --strip-debug.
Improve this answer. For me calling objcopy --strip-debug was not sufficient to please lintian. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. I followed my dreams and got demoted to software developer.