how to use zcat without the warning when using pipeHow do I prompt for Yes/No/Cancel input in a Linux shell script?How to check if a string contains a substring in BashHow to check if a program exists from a Bash script?How do I tell if a regular file does not exist in Bash?Pipe to/from the clipboard in Bash scriptHow to mkdir only if a dir does not already exist?How to pipe stderr, and not stdout?How do I reload .bashrc without logging out and back in?How to concatenate string variables in BashHow do I find all files containing specific text on Linux?
Can a stoichiometric mixture of oxygen and methane exist as a liquid at standard pressure and some (low) temperature?
Why is so much work done on numerical verification of the Riemann Hypothesis?
Terse Method to Swap Lowest for Highest?
Picking the different solutions to the time independent Schrodinger eqaution
Can I say "fingers" when referring to toes?
Is there a way to get `mathscr' with lower case letters in pdfLaTeX?
Keeping a ball lost forever
How do apertures which seem too large to physically fit work?
What is going on with 'gets(stdin)' on the site coderbyte?
Why did the EU agree to delay the Brexit deadline?
How to cover method return statement in Apex Class?
How to rewrite equation of hyperbola in standard form
Why "had" in "[something] we would have made had we used [something]"?
Why does a simple loop result in ASYNC_NETWORK_IO waits?
The IT department bottlenecks progress. How should I handle this?
Why does the Sun have different day lengths, but not the gas giants?
Non-trope happy ending?
creating a ":KeepCursor" command
It grows, but water kills it
Does the UK parliament need to pass secondary legislation to accept the Article 50 extension
What happens if you are holding an Iron Flask with a demon inside and walk into an Antimagic Field?
Can a College of Swords bard use a Blade Flourish option on an opportunity attack provoked by their own Dissonant Whispers spell?
Has any country ever had 2 former presidents in jail simultaneously?
Why can Carol Danvers change her suit colours in the first place?
how to use zcat without the warning when using pipe
How do I prompt for Yes/No/Cancel input in a Linux shell script?How to check if a string contains a substring in BashHow to check if a program exists from a Bash script?How do I tell if a regular file does not exist in Bash?Pipe to/from the clipboard in Bash scriptHow to mkdir only if a dir does not already exist?How to pipe stderr, and not stdout?How do I reload .bashrc without logging out and back in?How to concatenate string variables in BashHow do I find all files containing specific text on Linux?
I'm trying to silent zcat warning through the option -q or 2>/dev/null
so far nothing is working. I keep getting the same warning when a file name is missing.
I'm looping through 100s of compressed files to extract a specific data. The idea is if zcat encounter a bad name or a missing file name, zcat will just stay quite and wait for the next cycle, but currently this is what I'm getting when using both options
zcat -q $ram | head -n1 or zcat $ram | head -n1 2>/dev/null
gzip: compressed data not read from a terminal. Use -f to force decompression.
For help, type: gzip -h
Any idea how to solve that or a faster way to read a .gz file with a silent feature that works?
Thanks
linux bash compression ksh zcat
asked Mar 8 at 1:57
DrivenDriven
227
add a comment |
I'm trying to silent zcat warning through the option -q or 2>/dev/null
so far nothing is working. I keep getting the same warning when a file name is missing.
I'm looping through 100s of compressed files to extract a specific data. The idea is if zcat encounter a bad name or a missing file name, zcat will just stay quite and wait for the next cycle, but currently this is what I'm getting when using both options
zcat -q $ram | head -n1 or zcat $ram | head -n1 2>/dev/null
gzip: compressed data not read from a terminal. Use -f to force decompression.
For help, type: gzip -h
Any idea how to solve that or a faster way to read a .gz file with a silent feature that works?
Thanks
linux bash compression ksh zcat
asked Mar 8 at 1:57
DrivenDriven
227
2>/dev/nullshould work, and works fine for me from the command line. If this is from a script, can you edit your post to include a few lines of context?
– B. Shefter
Mar 8 at 3:15
1
sorry I updated the question I forgot to add the pipe. Yes!!! without it , it will work, but when I try to use pipe, it doesn't work.
– Driven
Mar 8 at 3:42
add a comment |
I'm trying to silent zcat warning through the option -q or 2>/dev/null
so far nothing is working. I keep getting the same warning when a file name is missing.
I'm looping through 100s of compressed files to extract a specific data. The idea is if zcat encounter a bad name or a missing file name, zcat will just stay quite and wait for the next cycle, but currently this is what I'm getting when using both options
zcat -q $ram | head -n1 or zcat $ram | head -n1 2>/dev/null
gzip: compressed data not read from a terminal. Use -f to force decompression.
For help, type: gzip -h
Any idea how to solve that or a faster way to read a .gz file with a silent feature that works?
Thanks
linux bash compression ksh zcat
asked Mar 8 at 1:57
DrivenDriven
227
I'm trying to silent zcat warning through the option -q or 2>/dev/null
so far nothing is working. I keep getting the same warning when a file name is missing.
I'm looping through 100s of compressed files to extract a specific data. The idea is if zcat encounter a bad name or a missing file name, zcat will just stay quite and wait for the next cycle, but currently this is what I'm getting when using both options
zcat -q $ram | head -n1 or zcat $ram | head -n1 2>/dev/null
gzip: compressed data not read from a terminal. Use -f to force decompression.
For help, type: gzip -h
Any idea how to solve that or a faster way to read a .gz file with a silent feature that works?
Thanks
linux bash compression ksh zcat
linux bash compression ksh zcat
asked Mar 8 at 1:57
DrivenDriven
227
asked Mar 8 at 1:57
DrivenDriven
227
edited Mar 8 at 3:37
Driven
asked Mar 8 at 1:57
DrivenDriven
227
asked Mar 8 at 1:57
DrivenDriven
227
asked Mar 8 at 1:57
DrivenDriven
227
227
2>/dev/nullshould work, and works fine for me from the command line. If this is from a script, can you edit your post to include a few lines of context?
– B. Shefter
Mar 8 at 3:15
1
sorry I updated the question I forgot to add the pipe. Yes!!! without it , it will work, but when I try to use pipe, it doesn't work.
– Driven
Mar 8 at 3:42
add a comment |
2>/dev/nullshould work, and works fine for me from the command line. If this is from a script, can you edit your post to include a few lines of context?
– B. Shefter
Mar 8 at 3:15
1
sorry I updated the question I forgot to add the pipe. Yes!!! without it , it will work, but when I try to use pipe, it doesn't work.
– Driven
Mar 8 at 3:42
2>/dev/null should work, and works fine for me from the command line. If this is from a script, can you edit your post to include a few lines of context?– B. Shefter
Mar 8 at 3:15
2>/dev/null should work, and works fine for me from the command line. If this is from a script, can you edit your post to include a few lines of context?– B. Shefter
Mar 8 at 3:15
1
1
sorry I updated the question I forgot to add the pipe. Yes!!! without it , it will work, but when I try to use pipe, it doesn't work.
– Driven
Mar 8 at 3:42
sorry I updated the question I forgot to add the pipe. Yes!!! without it , it will work, but when I try to use pipe, it doesn't work.
– Driven
Mar 8 at 3:42
add a comment |
1 Answer
1
active
oldest
votes
At present, you're redirecting only stderr from head; you're not redirecting from zcat at all. If you want to redirect stderr from zcat, then you need to put the redirection before the pipe symbol, like so:
zcat $ram 2>/dev/null | head -n1
answered Mar 8 at 3:49
B. ShefterB. Shefter
389111
thanks for the advice I will keep that in mind next time
– Driven
Mar 8 at 4:17
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55055664%2fhow-to-use-zcat-without-the-warning-when-using-pipe%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
At present, you're redirecting only stderr from head; you're not redirecting from zcat at all. If you want to redirect stderr from zcat, then you need to put the redirection before the pipe symbol, like so:
zcat $ram 2>/dev/null | head -n1
answered Mar 8 at 3:49
B. ShefterB. Shefter
389111
thanks for the advice I will keep that in mind next time
– Driven
Mar 8 at 4:17
add a comment |
At present, you're redirecting only stderr from head; you're not redirecting from zcat at all. If you want to redirect stderr from zcat, then you need to put the redirection before the pipe symbol, like so:
zcat $ram 2>/dev/null | head -n1
answered Mar 8 at 3:49
B. ShefterB. Shefter
389111
thanks for the advice I will keep that in mind next time
– Driven
Mar 8 at 4:17
add a comment |
At present, you're redirecting only stderr from head; you're not redirecting from zcat at all. If you want to redirect stderr from zcat, then you need to put the redirection before the pipe symbol, like so:
zcat $ram 2>/dev/null | head -n1
answered Mar 8 at 3:49
B. ShefterB. Shefter
389111
At present, you're redirecting only stderr from head; you're not redirecting from zcat at all. If you want to redirect stderr from zcat, then you need to put the redirection before the pipe symbol, like so:
zcat $ram 2>/dev/null | head -n1
answered Mar 8 at 3:49
B. ShefterB. Shefter
389111
answered Mar 8 at 3:49
B. ShefterB. Shefter
389111
answered Mar 8 at 3:49
B. ShefterB. Shefter
389111
answered Mar 8 at 3:49
B. ShefterB. Shefter
389111
389111
thanks for the advice I will keep that in mind next time
– Driven
Mar 8 at 4:17
add a comment |
thanks for the advice I will keep that in mind next time
– Driven
Mar 8 at 4:17
thanks for the advice I will keep that in mind next time
– Driven
Mar 8 at 4:17
thanks for the advice I will keep that in mind next time
– Driven
Mar 8 at 4:17
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55055664%2fhow-to-use-zcat-without-the-warning-when-using-pipe%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2>/dev/nullshould work, and works fine for me from the command line. If this is from a script, can you edit your post to include a few lines of context?– B. Shefter
Mar 8 at 3:15
1
sorry I updated the question I forgot to add the pipe. Yes!!! without it , it will work, but when I try to use pipe, it doesn't work.
– Driven
Mar 8 at 3:42