ASIC/FPGA Design and Verification Out Source Services

Recursive Search

A simple -one line- script to recursively search files based on find and grep.
The script was tested on debian bash.

1. First I put an alias to easily invoke the script. This is done by placing the following line in your ~/.bash_aliases file:
alias Fg="~/bin/fg.unx"


2. Next comes the simple script:
   
#!/bin/bash

if [ "$#" -eq 0 ]
then
  echo "example fg \"*.html\" n \"courier\""
  echo "days ago for file lookup"
  echo "example fg \"*.html\" n \"courier\" -30"
  exit
fi

echo "start ------"
if [ "$4" = "" ] ; then
  find . -name "$1" -exec grep -$2 "$3" /dev/null {} \;
else
  find "$4" -name "$1" -exec grep -$2 "$3" /dev/null {} \; | gvim - +/"$3"
fi

Note: the parameters n and l are the ones given to grep command.
Also note: you can, optionally, specify a starting directory (the default is . pwd).


3. Another way of doing the same is from a bash script
   #!/bin/bash
   
   for i in $(find . -name "*.e"); do perl ~/bin/cmp_diff.pl "$i" "$1"/; done
   for i in $(find . -name "*.vhd"); do perl ~/bin/cmp_diff.pl "$i" "$1"/; done
   
   Note: that in some cases it is simpler to use diff with recursive option:
   diff -qr dir_1 dir_2
   


4. Or simply do a one command using for, find and grep - all combined together for a powerful search and grep command:
   
   for f in `find . -type f`; do grep -l "list.*Check" $f; done
   for f in `find . -name "*.e"`; do grep -l "list.*Check" $f; done
   
   Sometimes you want to do it without a script, but rather from the command line.
   On bash you would do:
   for x in `ls` <cr>
   do <cr>
   echo $x <cr>
   done <cr>
   
   On tcsh you would do:
   foreach x (dir_1 dir_2) <cr>
   echo $x <cr>
   svn exp $x <cr>
   end <cr>
   
   To extract a filed from list in file and sort it:
   foreach x ( `cat /tmp/debug.txt | awk '{print $3}' | sort -u ` )
   ...
   
   
   If you run find from multiple terminals, with a unique search pattern, you can save the results in different files:
   
   x=Fp_$$; date > $x;for f in `find . -name "*.e"`; do grep "list.*byte.*;" $f >> $x && echo "File="$f >> $x; done
   
   Note: each file has a unique name, which starts with Fp_ and concatenated with the shell process ID ($$).

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