bash - Shell - Pipe to multiple commands in a file -

i want run 2 commands on piped-in input , want print (to stdout) output of both.

each command combination of grep, sed , awk.

both these commands must reside in single .sh file.

sample commands:

cat mult_comm.sh        sed 's/world/boy/g'|grep boy ; grep world  # input cat input.log hello world  # command has work cat input.log | bash mult_comm.sh 

expected output

hello boy hello world 

actual output

hello boy 

i tried using tee

cat mult_comm.sh tee >(sed 's/world/boy/g'|grep boy) | grep world 

but gives

hello world 

i can modify .sh file want piped command can't changed. ideas?

this similar os x / linux: pipe 2 processes? , pipe output 2 different commands, can't figure out how use named pipes inside script.

when execute

tee >(some_command) 

bash creates subshell run some_command. subshell's stdin assigned reading half of pipe. bash leaves name of pipe on command line, tee pump input pipe. subshell's stdout , stderr left unchanged, still same tee's.

so, when execute

tee >(some_command) | some_other_command 

now, bash first creates process run tee, , assigns stdout writing half of pipe, , process run some_other_command, stdin assigned reading half of same pipe. creates process run some_command, above, assigning stdin reading half of pipe, , leaving stdout , stderr unchanged. however, stdout has been redirected some_other_command, , that's some_command inherits.

in actual example,

tee >(sed 's/world/boy/g'|grep boy) | grep world 

we end with:

                  -->  sed 's/world/boy/g' -->  grep boy --                  /                                         \ input --> tee --<                                           \                  \                                           \                   ----------------------------------------------> grep world  

in 1 of questions linked in op, there (non-accepted correct) answer f. hauri, i've adapted here:

echo hello world | ((tee /dev/fd/5 | grep world >/dev/fd/4) \            5>&1 | sed 's/world/boy/' | grep boy) 4>&1 

it takes little practice read bashisms above. important part that

( commands ) 5>&1 

creates subshell (( )) , gives subshell fd numbered 5, copied stdout (5>&1). inside subshell, /dev/fd/5 refers fd. within subshell, possible redirect stdout, happen after stdout copied fd5.