Difference between revisions of "Bash"

Revision as of 05:34, 20 November 2009

Here are some of my BASH tricks

Find files containing MMU in the name, do a line count, and them add them up. The first part finds files, then redirects the output of the line counts to a temp file

[tom@garak gaisler]$ for i in $(find|grep mmu); do wc $i -l; done>~/leon3_mmu_linecount

The output file:
655 ./leon3/mmutlb.vhd
351 ./leon3/mmuconfig.vhd
258 ./leon3/mmutw.vhd
176 ./leon3/mmulru.vhd 
1559 ./leon3/mmu_dcache.vhd
202 ./leon3/libmmu.vhd
245 ./leon3/mmuiface.vhd
609 ./leon3/mmu.vhd
148 ./leon3/mmu_cache.vhd
189 ./leon3/mmutlbcam.vhd
380 ./leon3/mmu_acache.vhd
111 ./leon3/mmulrue.vhd
662 ./leon3/mmu_icache.vhd

The second part cuts the first field of the file, which is an integer containing the line count, and add all of them up

[tom@garak gaisler]$ PASS=0;for i in $(cat ~/leon3_mmu_linecount|cut -d" " -f1); do PASS=$(($PASS+$i)); done; echo $PASS lines total
5545 lines total

--Done--

Remove all synopsys dirs in path, so we can use a different version (need a bit of work, since it doesn't redirect to stdout for some reason)

echo $PATH|sed s/\:/\\n/g|grep -v synopsys|tr '\n' ':'

Find Hacks

Find using wildcards, and multiple names

find -name "*.v" -o -name "*.h"   
This finds all *.v and *.h files. Note that wildcards are enclosed in quotes; or the shell will interpret it!
The -o option is necessary when specifying multiple instances of an option.

Find files, then grep them.

find "*.h" -exec grep "FE_BITS" -Hn {} \; 
This greps every file, and prints the filename and line number of each instance

AWK Hacks

--Currently, awk cannot handle files in-place. So redirect to a new_file, then mv the new_file to the old_file.

Print out n'th field, where deliminator is 1 or more spaces, replace $1 with the number field you want e.g. $3 is third field.

cat orig_file|awk '{print $1}'> new_file

Print out only unique lines, first instance only. The uniq command does not always work correctly!

cat orig_file|awk '!x[$0]++' > new_file

BASH Inline Tricks

bash is very powerful. Knowing how to use the 'one-liners' will save significant amounts of time.

Inline Loop

This is a simple for loop, parsing in every line of ls and echoing it.

 for i in `ls`; do echo $i; done

for each `define in fe.h, take second field, and make a $display statement with. Notice the semicolons

 for i in `cat fe.h|grep ^'\`define'|awk '{print $2}' `; do echo "\$display (\"" $i = \%d\"\, $i \)\;; done>fe_print.v