Echo Not Working Shell
This wouldn't make sense in general: the terminal might not exist any more, or it might be in use by a different user. Edit Giving the stty --all command as per John S. You can also subscribe without commenting. Browse other questions tagged bash input echo sh or ask your own question. http://tubemuse.com/not-working/echo-not-working-in-php.html
So as well as being useful at the command line, its use permeates any UNIX system. Is the untested/empty statement true? Print all the files/folder using echo command (ls command alternative). $ echo * 103.odt 103.pdf 104.odt 104.pdf 105.odt 105.pdf 106.odt 106.pdf 107.odt 107.pdf 108a.odt 108.odt 108.pdf 109.odt 109.pdf 110b.odt 110.odt 110.pdf Did the GoF really thoroughly explore "Pattern Space"?
Echo -e Not Working Bash
You can try: $ POSIXLY_CORRECT=1 /bin/echo -en '\x61' -en \x61 $ env BASHOPTS=xpg_echo POSIXLY_CORRECT=1 bash -c "echo -en '\x61'" -en a (You should read this for more details). Wheeler's excellent article on Filenames and Pathnames in Shell, which is worth reading in its entirety: Double-quote all variable references and command substitutions unless you are certain they can only contain If you check for the presence of 2 files for example with [ -e FOO -o -e BAR ], then the check isn't short circuited and 2 disk seeks are performed.
The complete reason why this does not work looks like a pretty deep rabbithole (tty, ioctl, etc) so I can't say I understand completely, but it's not voodoo anymore, so thanks Bash Script Printf is not redundant: grep -q 'regex' FILE; local st=$? There is warning message sent to the error output file, and vim sets and resets the tty settings correctly. http://unix.stackexchange.com/questions/211028/bin-sh-echo-operator-not-working-as-expected Use a template that is known to work correctly (see paper).
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Bash Script Printf
It felt random, but I bet it was always when I was trying to do something with vi that didn't exit cleanly or used a pipe. –Michael Mathews Oct 7 '14 navigate here Possible repercussions from assault between coworkers outside the office Is there an actual army in 1984? Taking Control Back as a DM? TSA broke a lock for which they have a master key. Bash Echo
GO OUT AND VOTE How many seconds are a meter in the 4th dimension? share|improve this answer answered Apr 9 '13 at 10:00 choroba 108k1092151 my shell works fine, like I said: It works if I just type it into the terminal Oh That's local Unix email, not whatever external POP or IMAP account you may have set up in some email program. Check This Out These Aren't Roasted!
Instead scripts tend to evolve from existing interactive command line use, or are based on existing scripts which themselves have propagated the limitations of ancient shell script interpreters. asked 1 year ago viewed 987 times active 1 year ago Linked 348 Why is printf better than echo? While there are lots of shell programming pitfalls, at least the interpreter will tell you immediately about them.
Robustness Aaron Maxwell wrote up a good summary of settings and consequences for an unofficial strict mode for bash which is worth considering for your bash scripts at least.
- printf 'foo\nbar\n' printf '%s\n%s\n' foo bar You can control the expansion of backslash escape sequences of bash’s echo built-in command with the xpg_echo shell option.
- if [ $st = 1 ]; then echo no-match fi needless shell logic We'll expand on this below, but we should do as little in shell as possible, over its domain
- i want out put like below: Hello world Hello world Hello world Hello world Hello world like 10 times Reply Ravi Saive says: February 8, 2016 at 8:52 pm @Sravanthi, Instead
- Consider what happens if `pidof` returns 2.
- share|improve this answer answered Apr 9 '13 at 10:00 Axel 8,54732349 Thanks it's working now.
It's much better to test scripts directly in a POSIX compliant shell if possible. I think some of the reason shell scripts tend to have lots of issues is that commonly one doesn't learn shell scripting like "traditional" programming languages. One of the references mentions that vim sets stdin to stdout (still the tty) because stdin has been set to /dev/null in these situtations. For example: pidof program if [ $? = 1 ]; then echo "program not found" fi Note this is not just stylistic actually.
Could you elaborate on that? If they fail to do this properly the tty is left in the funny state you have discovered. Using option ‘\t‘ – horizontal tab with backspace interpretor ‘-e‘ to have horizontal tab spaces. $ echo -e "Tecmint \tis \ta \tcommunity \tof \tLinux \tNerds" Tecmint is a community of Linux this contact form Related 5Passing a bash command-line argument containing a dot11Escape sequences with “echo -e” in different shells2echo \\* - bash backslash escape behavior, is it evaluated backwards?4Echo command with AND operator doesn't
So I use [ "$var" = "find" ] && echo "found" instead of the equivalent: if [ "$var" = "find" ]; then echo "found" fi [ x"$var" = x"find" ] && My cat sat on my laptop, now the right side of my keyboard types the wrong characters GO OUT AND VOTE How to handle swear words in quote / transcription? "The The echo can be used with redirect operator to output to a file and not standard output. $ echo "Test Page" > testpage ## Check Content [email protected]:~$ cat testpage Test Page How?
Use printf, printf '%b', or with bash or ksh, the $'' special quoting. –ormaaj Apr 22 '12 at 12:22 add a comment| Your Answer draft saved draft discarded Sign up Did the GoF really thoroughly explore "Pattern Space"? Does the Rothschild family own most central banks? Even the following code,(which I intend to use in another code) is not working , Code: #!/bin/bash number=$RANDOM; echo $number; Instead of $RANDOM if , I say number=1 , echo is
But modern shells implement '[' internally, so there is no such overhead. © May 13 2008 printf '%s\n%s\n' "Hello" "World" printf '%s\n' "Hello\nWorld" share|improve this answer answered Mar 11 '11 at 21:37 Dennis Williamson 58.5k11107142 Thanks a lot for your answer –Bashuser Mar 11 '11 Music notation software for ubuntu Why Would the President-elect have a Transition Visit before December 19? Feel free to use “--” between options and pathnames, but only as an additional optional protective measure.
In particular, never start a glob with “?” or “*” (such as “*.pdf”); always prepend globs with something (like “./”) that cannot expand to a dash. Note I've never needed to resort to bash specific constructs in my scripts. Float matrix left among other matrices What is the most someone can lose the popular vote by but still win the electoral college?