08-04-2009
stampare righe precedenti ad un match in file
Salve a tutti...volevo chiedere a voi,che sicuramente ne sapete piu di me,come posso ottenere la seguente soluzione:
ho un file del tipo:
CIAO COME STAI
PERCHE COME STAI
CIAO COME VA
ALLO CHE FACCIAMO
.................
io vorre che nel caso in cui in una riga è presenta la parola "CHE" allora stampo a video le tre righe precedenti alla parola ottenendo quindi:
CIAO COME STAI
PERCHE COME STAI
CIAO COME VA
Come shell uso la KORN SHELL..vi ringrazio in anticipo per l'aiuto...
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VM(1) mgetty VM(1)
NAME
vm - VoiceModem is the program for handling the voice modem functionality from shell scripts
ACTIONS
beep options [<frequency [<length in 0.001sec>]]>
diagnostics options device name (e.g. ttyS2
dial options phone number
help
play options [<file names]+>
record options file name
shell options [<shell script [shell options]]>
wait options [<time in seconds]>
devicetest
OPTIONS
-c n use compression type n
-d n set i/o device
-t, -m, -i, -e, -s, -H equals to -d <2,3,4,5,6,7>
-l s set device string (e.g. -l ttyS2:ttyC0)
-v verbose output
-w use off / on hook signal from local handset to start and stop recording
-x n set debug level
-L n set maximum recording length in sec
-P print first DTMF tone on stdout and exit
-R read and print DTMF string on stdout and exit
-S s set default shell for shell scripts (e.g. -S /bin/sh)
-T n set silence timeout in 0.1sec
-V n set silence threshold to <n> (0-100%%)
SEE ALSO
vgetty(1)
POD ERRORS
Hey! The above document had some coding errors, which are explained below:
Around line 30:
You forgot a '=back' before '=head1'
Around line 32:
'=item' outside of any '=over'
Around line 71:
You forgot a '=back' before '=head1'
perl v5.10.1 2010-04-04 VM(1)