find and grep

find/2_Combine_find_and_grep_with_exec/code

@@ -0,0 +1 @@
+find /usr/share -name "*.py" -type f -executable  -exec grep -Hnsw "return" {} \;

find/2_Combine_find_and_grep_with_exec/info

@@ -0,0 +1,80 @@
+Find all files with extension .py and exec permissions, grep only rows that contain *return* word.
+
+
+[source.sh]
+----
+find /usr/share -name "*.py" -type f -executable  -exec grep -Hnsw "return" {} \;
+
+
+search for files in a directory hierarchy
+
+-name pattern
+       Base of file name (the path with the leading directories removed) matches shell  pattern  pattern.
+       The  metacharacters  (`*',  `?',  and  `[]')  match a `.' at the start of the base name (this is a
+       change in findutils-4.2.2; see section STANDARDS CONFORMANCE below).  To ignore  a  directory  and
+       the  files  under  it,  use  -prune;  see  an example in the description of -path.  Braces are not
+       recognised as being special, despite the fact that some shells including Bash imbue braces with  a
+       special  meaning  in  shell  patterns.   The  filename  matching  is performed with the use of the
+       fnmatch(3) library function.   Don't forget to enclose the pattern in quotes in order  to  protect
+       it from expansion by the shell.
+
+type c
+       File is of type c:
+
+       b      block (buffered) special
+
+       c      character (unbuffered) special
+
+       d      directory
+
+       p      named pipe (FIFO)
+
+       f      regular file
+
+       l      symbolic link
+
+       s      socket
+
+
+-exec command ;
+       Execute  command;  true  if 0 status is returned.  All following arguments to find are taken to be
+       arguments to the command until an argument consisting of `;' is encountered.  The string  `{}'  is
+       replaced  by  the  current  file name being processed everywhere it occurs in the arguments to the
+       command, not just in arguments where it is alone, as in some versions  of  find.   Both  of  these
+       constructions  might  need  to be escaped (with a `\') or quoted to protect them from expansion by
+       the shell.  See the EXAMPLES section for examples of the use of the -exec option.   The  specified
+       command  is  run  once  for each matched file.  The command is executed in the starting directory.
+       There are unavoidable security problems surrounding use of the -exec action; you  should  use  the
+       -execdir option instead.
+
+grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus
+(-) is given as file name) for lines containing a match to the given PATTERN.  By  default,  grep  prints
+the matching lines.
+
+print lines matching a pattern
+
+-H, --with-filename
+       Print  the  file  name  for  each  match.  This is the default when there is more than one file to
+       search.
+
+-n, --line-number
+       Prefix  each  line of output with the 1-based line number within its input file.  (-n is specified
+       by POSIX.)
+
+-s, --no-messages
+       Suppress error messages about nonexistent or unreadable files.  Portability note: unlike GNU grep,
+       7th  Edition  Unix  grep  did not conform to POSIX, because it lacked -q and its -s option behaved
+       like GNU grep's -q option.  USG-style grep also lacked -q but its -s option behaved like GNU grep.
+       Portable  shell  scripts should avoid both -q and -s and should redirect standard and error output
+       to /dev/null instead.  (-s is specified by POSIX.)
+
+-w, --word-regexp
+       Select  only  those lines containing matches that form whole words.  The test is that the matching
+       substring must either be at the beginning of the line,  or  preceded  by  a  non-word  constituent
+       character.   Similarly,  it  must  be  either  at  the  end  of the line or followed by a non-word
+       constituent character.  Word-constituent characters are letters, digits, and the underscore.
+
+----
+
+
+

index_find.yml

@@ -49,3 +49,26 @@
       points: "" # ELO
       output:
         log: "bash"
+  2_Combine_find_and_grep_with_exec:
+    display_name: "Combine_find_and_grep_with_exec"
+    swarmlabservice: "os2"
+    info:
+      file: "2_Combine_find_and_grep_with_exec/info"
+    code:
+      lang: "bash"
+      exec: "/bin/bash"
+      file: "2_Combine_find_and_grep_with_exec/code"
+      data: "2_Combine_find_and_grep_with_exec/data"
+      options: ""
+      mimetype: "bash"
+      output:
+        log: "console"
+        mimetype: "bash"
+    challenge:
+      question: "2_Combine_find_and_grep_with_exec/q-info"
+      codehelp: "2_Combine_find_and_grep_with_exec/codehelp"
+      codeanswer: "2_Combine_find_and_grep_with_exec/codeanswer"
+      mimetype: "bash"
+      points: "" # ELO
+      output:
+        log: "bash"