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Browse other questions tagged command-line io-redirection cat or ask your own question. The reason that the file should be in the same directory is because that's the easiest way to guarantee that it's on the same filesystem; this is useful because mv across If you need to separately eliminate them then you must test each one explicitly: for f in *.html; do if test ! -d "$f"; then process "$f" fi done A variant Reply Link Britt July 1, 2013, 3:22 amWhat does this command do? http://dwoptimize.com/error-code/unix-error-code-13.html

The number of times the pattern is found is assigned to the variable i. Anything I can do? Binary to decimal converter How are brakes cooled on heavy aircraft? The original file or files are not modified or deleted. https://www.gnu.org/fun/jokes/unix.errors.html

Unix Error Code

Many operating systems do this by default and ignore the flag.[citation needed] If one of the input filenames is specified as a single hyphen (-), then cat reads from standard input Thanks. –Macky Aug 19 '13 at 10:10 | show 3 more comments up vote 0 down vote Because it is assuming cat as a filename. The cat program chooses to interpret that parameter as a file name - and tries to open the file. For example: sfere$ cat t #! /bin/sh set -e for file; do sed < "$file" > "$file.tmp" 's/foo/bar/g' mv "$file.tmp" "$file" done sfere$ ./t input sed: Couldn't close {standard output}: No

Password Home Search Forums Register Forum RulesMan PagesUnix Commands Linux Commands FAQ Members Today's Posts Shell Programming and Scripting BSD, Linux, and UNIX shell scripting Post awk, bash, csh, ksh, Copyright Infringement Notification Updated: $Date: 2014/08/12 05:04:12 $ current community chat Unix & Linux Unix & Linux Meta your communities Sign up or log in to customize your list. The cause is the same - but it is from 2 different programs (cat and bash). Reply Link prabhat January 17, 2014, 1:35 pmjames: u can use uniq command.

In such cases, these problems wouldn't arise. Linux Humor Why does MIT have a /8 IPv4 block? How can I use cat command in UNIX or Linux shell scripts? website here share|improve this answer edited Nov 24 at 13:53 Tulains Córdova 3121415 answered Nov 24 at 11:06 dr01 6,00252338 add a comment| up vote 19 down vote In $ cat foo the

I'll edit my nonsense. –Claus Andersen Nov 24 at 11:34 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up What are the downsides to multi-classing? Now, I wonder where the second message comes from, considering that it starts with bash:... –Dmitry Grigoryev Nov 25 at 14:12 | show 1 more comment 2 Answers 2 active oldest Sometimes it isn't appropriate to exit on a failure.

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Redundant cat It seems to be extremely common to use "cat" to feed input into some filter. http://www.unix.com/shell-programming-and-scripting/172306-cat-command-error.html It doesn't make this script itself exit with a nonzero status (so some further script that invoked it wouldn't be easily able to tell whether it succeeded or failed). Unix Error Code The value of my variable was still 0 even though I know that the file has 1 occurence of the pattern. –Macky Aug 19 '13 at 9:59 Why do Linux Kernel Error Codes Also, note that the "trap" command appears inside the loop rather than outside the loop: otherwise, when the script is invoked with no arguments, the file ".tmp" will be deleted.

It's too many arguments no matter where they come from. For example, $ cat /proc/cpuinfo | grep model Can be used as follows: $ grep model /proc/cpuinfo Another example, cat filename | sed -e 'commands' -e 'commands2' Can be used as The real limit is much higher than 10 but hopefully that gets the idea across. Remove advertisements Sponsored Links Corona688 View Public Profile Visit Corona688's homepage! A common approach is to take a backup copy before writing the new one: cp /etc/resolv.conf /etc/resolv.conf.bak Although this means the information can be easily recovered, we can actually do better Linux Error Code

Schwartz. Linked 162 Difference between single and double quotes in Bash Related 2212Check if a directory exists in a shell script511Use grep --exclude/--include syntax to not grep through certain files249Unix shell script The one exception is that a backslash followed by a newline doesn't quote the newline: it removes it (and the backslash) entirely, allowing a command to span multiple lines. his comment is here Pipelines can be avoided using temporary files to hold intermediate data (but this may be inappropriate if the intermediate data is large, or needs to be processed immediately) or perhaps by

Not the answer you're looking for? Why does MIT have a /8 IPv4 block? just write uniq Reply Link prabhat January 17, 2014, 1:36 pmuniq filename Reply Link lurvas777 April 4, 2014, 8:41 pmTanks a ton!!

Introduction Bourne shell is a useful scripting language but it turns out that there are a number of easy mistakes to make when using it, whether interactively or in a script.

The way to avoid too many arguments is to not use too many arguments. Here, it's a very valid question. –Stéphane Chazelas Nov 24 at 11:22 16 It should be cat < food instead of cat < foo –Tulains Córdova Nov 24 at 13:52 Certain characters, like space and tab, which have special meaning outside of quotes lose that meaning inside double quotes. If the other doesn't exist, I don't care, I just want to concatenate what I can.

Remove advertisements Sponsored Links Corona688 View Public Profile Visit Corona688's homepage! This is worth knowing for cases where what you want is all of the script arguments joined together into one.) An unquoted [email protected] is no different to $*. A task that is solvable in polynomial time but not verifiable in polynomial time Views Block Question How can I diagnose possible problems with my breadboards? http://dwoptimize.com/error-code/unix-tcp-ip-error-codes.html The error printed onscreen depends entirely on what was decided by the programmer of the command.

Redundant cat 2. BACK TO TOP FSF FREESOFTWAREDIRECTORY HARDWARE GNUART GNU'SWHO? more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed The problem is quite simple: if you don't use quoting in the right place, then your script won't behave properly.

Please send general FSF & GNU inquiries to . Join them; it only takes a minute: Sign up Unix Cat : No such file or directory error up vote 1 down vote favorite 1 I have the following script #!/bin/bash If there are too many, it will run the program several times. How should I tell my employer?

in cat < foo, cat is not invoked if the redirection fails. Sometimes the cat command failed because there were too many files in the directory for cancateration. That (and having consistent error message) is one reason why it's often better to use redirection where possible. UNIX is a registered trademark of The Open Group.

What do you do with all the bodies? CSTR. more hot questions question feed about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science However when there are too many files, it failed the "ls" command as well.

For example: cat file | grep searchstring The effect of this is to create a pipe, executing "cat file" with its output redirected to the pipe and "grep searchstring" with its The problems this causes might be more clearly illustrated by an example which actually tries to do something with the files: sfere$ for x in `ls s*`; do ls -l "$x"; Newlines stand for themselves. " ", $, `, \ Directly quote any character except " itself, plus $, ` and \; all of these must be escaped.