> does not append, > overwrites. So, for each file, overwrite the temp file, then overwrite the original.
If you have GNU sed, you can sed -i to edit in-place instead of cat-ing the new file atop the old.
I don't like the look of this, editing your originals is dangerous, so as a first step BACK UP YOUR FILES. One program bug could wipe out the data of interest here.
Hello
I have the following output which is returned with the Month in text format instead of numerical. The output I receive is performed by using Rational Synergy CM software commands from the Unix command line and piping Unix commands on the end.
bash-3.00$ ccm query -n... (4 Replies)
Hi guys,
say I have a few files in a directory (58 text files or somthing)
each one contains mulitple strings that I wish to replace with other strings
so in these 58 files I'm looking for say the following strings:
JAM (replace with BUTTER)
BREAD (replace with CRACKER)
SCOOP (replace... (19 Replies)
Hi,
I'd like to process multiple files. For example:
file1.txt
file2.txt
file3.txt
Each file contains several lines of data. I want to extract a piece of data and output it to a new file.
file1.txt ----> newfile1.txt
file2.txt ----> newfile2.txt
file3.txt ----> newfile3.txt
Here is... (3 Replies)
Is there anyway to accomplish this?
(ksh)
FILES_TO_PROCESS='NAME1 NAME2'
SOURCE_NAME1=/tmp/myfile
TARGET_NAME1=/somewhere/else
# other file names
for i in $FILES_TO_PROCESS
do
file1=SOURCE_$i
file2=TARGET_$i
echo cp ${$file1} ${$file2} <-- how do get this to work.
done (2 Replies)
Hello. This shouldn't be an unusual problem, but I cannot find anything about it at google or at other search machine.
So, I've made an application using C++ and QtCreator. I 've made a new mime type for application's project files.
My system (ubuntu 10.10), when I right click a file and I... (3 Replies)
Dear All,
I am trying to write a Unix Script which fires a sql query. The output of the sql query gives multiple rows. Each row should be saved in a separate Unix File.
The number of rows of sql output can be variable. I am able save all the rows in one file but in separate files.
Any... (14 Replies)
Hi, I'm trying to get multiple substitutions in one expression using sed:
echo "-foo-_-bar--foo-_bar_-_foo_bar_-foo_-_bar_-" | sed -e "s//-/g"
So, as you can see I'm trying to replace all instances of _-, -_, -- with - (dash)
I have provided bad example. The question is how to use multiple... (6 Replies)
Hello Gurus,
I have a multiple pipe separated files which have records going over multiple Lines. End of line separator is \n and records going over multiple lines have <CR> as separator. below is example from one file.
1|ABC DEF|100|10
2|PQ
RS
T|200|20
3| UVWXYZ|300|30
4| GHIJKL|400|40... (7 Replies)
I have 4000 files like
$cat clus_grp_seq10_g.phy
18 1002
anig_OJJ65951_1 ATGGTTTCGCAGCGTGATAGAGAATTGTTTAGGGATGATATTCGCTCGCGAGGAACGAAGCTCAATGCTGCCGAGCGCGAGAGTCTGCTAAGGCCATATCTGCCAGATCCGTCTGACCTTCCACGCAGGCCACTTCAGCGGCGCAAGAAGGTTCCTCG
aver_OOF92921_1 ... (1 Reply)
Hello All,
just wanted to export multiple tables from oracle sql using unix shell script to csv file and the below code is exporting only the first table.
Can you please suggest why? or any better idea?
export FILE="/abc/autom/file/geo_JOB.csv"
Export= `sqlplus -s dev01/password@dEV3... (16 Replies)
Discussion started by: Hope
16 Replies
LEARN ABOUT CENTOS
unbuffer
UNBUFFER(1) General Commands Manual UNBUFFER(1)NAME
unbuffer - unbuffer output
SYNOPSIS
unbuffer program [ args ]
INTRODUCTION
unbuffer disables the output buffering that occurs when program output is redirected from non-interactive programs. For example, suppose
you are watching the output from a fifo by running it through od and then more.
od -c /tmp/fifo | more
You will not see anything until a full page of output has been produced.
You can disable this automatic buffering as follows:
unbuffer od -c /tmp/fifo | more
Normally, unbuffer does not read from stdin. This simplifies use of unbuffer in some situations. To use unbuffer in a pipeline, use the
-p flag. Example:
process1 | unbuffer -p process2 | process3
CAVEATS
unbuffer -p may appear to work incorrectly if a process feeding input to unbuffer exits. Consider:
process1 | unbuffer -p process2 | process3
If process1 exits, process2 may not yet have finished. It is impossible for unbuffer to know long to wait for process2 and process2 may
not ever finish, for example, if it is a filter. For expediency, unbuffer simply exits when it encounters an EOF from either its input or
process2.
In order to have a version of unbuffer that worked in all situations, an oracle would be necessary. If you want an application-specific
solution, workarounds or hand-coded Expect may be more suitable. For example, the following example shows how to allow grep to finish pro-
cessing when the cat before it finishes first. Using cat to feed grep would never require unbuffer in real life. It is merely a place-
holder for some imaginary process that may or may not finish. Similarly, the final cat at the end of the pipeline is also a placeholder
for another process.
$ cat /tmp/abcdef.log | grep abc | cat
abcdef
xxxabc defxxx
$ cat /tmp/abcdef.log | unbuffer grep abc | cat
$ (cat /tmp/abcdef.log ; sleep 1) | unbuffer grep abc | cat
abcdef
xxxabc defxxx
$
BUGS
The man page is longer than the program.
SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
AUTHOR
Don Libes, National Institute of Standards and Technology
1 June 1994 UNBUFFER(1)