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Top Forums Shell Programming and Scripting Read file from input and redirect to output file Post 302845443 by rohit_shinez on Wednesday 21st of August 2013 02:03:23 PM
Old 08-21-2013
Read file from input and redirect to output file

Hi ,

i am having an file which contains 5 file_name data, i need to read the file name and will perform certain operation and generate out file names with named as 5 individual file_names
for eg:
Code:
file.txt contains
file_name1.txt|hai
file_name2.txt|bye
file_name3.txt|how
file_name4.txt|are
file_name5.txt|you

i will read using 
for i in `cat file.txt`
and do certain operations like

sed '$d' file_name1.txt >file_name1.tmp
echo "read the second row from file.txt">>file_name1.tmp
mv file_name1.tmp file_name1.txt

like the above i need to perform for all files and my output files should be
file_name1.txt
.
.
.
.
last line to print hai

file_name2.txt
.
.
.
bye

like this i need 5 individual files

 

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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat, read, nobs - catenate files SYNOPSIS
cat [ file ... ] read [ -m ] [ -n nline ] [ file ... ] nobs [ file ... ] DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus cat file prints a file and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input. Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts. The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines. Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a- time data. It never reads any more data from the input than it prints to the output. Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window. SOURCE
/src/cmd/cat.c /src/cmd/read.c /bin/nobs SEE ALSO
cp(1) DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines. BUGS
Beware of and which destroy input files before reading them. CAT(1)
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