Questions tagged [printf]
The shell builtin command that formats and prints data. Questions that deal with printf command or broadly using printf syntax by programming language (like awk, PHP, perl, C++...)
290 questions
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29views
How does printf() actually work? [duplicate]
When I execute the c file #include <stdio.h> #include <stdlib.h> int main(){ printf("before the system call. I am too excited!\n"); system("ps"); ...
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1vote
0answers
54views
Rubbish value outputed by printf "%f" 380
The command printf "%d, %f, %o, %s, %x, %X\n" 380 380 380 380 380 380 outputs 380, 20689...2384.000000, 574, 380, 17c, 17C where the second output is a very large (with almost thousand ...
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-1votes
1answer
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Why is the printf Output Order Not Respected in a Concurrent Scenario with Piped or Redirected stdout?
We are in a concurrent scenario where we have n concurrent processes. By using a synchronization policy (e.g., using pipes or signals), each process can print using printf("string\n") only ...
-1votes
3answers
139views
How to write script prefix braces with backslashes
I already posted add escape character with bash. I need script to this for every line in a file that starts with {@codeBlock so {@codeBlock: TEstBigquerry.buildPicks} should look like \{@codeBlock:\ ...
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0votes
1answer
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Format output and columms
In Linux in Bash in a for loop i do: ... ; do echo "$i --> $i-new" ; ... The output is than something like this: file1 --> file1-new file2 --> file2-new ... file9 --> ...
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-2votes
2answers
192views
How to add string at a specific position in each line
With awk '{ printf "%-15s %s\n", $1, $2 }' renamed | sort -V ... I get good output from the file renamed. It looks like: file1 file1.new But I want to have the output changed to ...
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0votes
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43views
printf seems to fail in bash [duplicate]
With version GNU bash, version 5.2.32(1)-release (x86_64-pc-linux-gnu) in present Debian testing this command: $ printf '%010f\n' '1234' 000.000000 Doesn't use the number given and changes on every ...
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7votes
3answers
335views
Bash printf float formatting became nonsensical and random
Bash printf floating number formatting (with %f or %g) is suddenly completely wrong, and changing all the time. An example output: $ export LC_ALL=C $ printf '%g\n' 1 1.20739e+3531 $ printf '%g\n' 1 4....
5votes
1answer
360views
printf in Zsh does not shell escape exclamation mark
In Zsh 5.9, we can use printf to shell escape a string: $ printf '%q' 'One! Two' One\!\ Two This produces the correct output of escaping the ! and the space. Now let’s make it as a script: #!/bin/...
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7votes
1answer
1kviews
printf - store formatted string output in a variable
Instead of the following printf '%s\t%s\t%s\t%s\n' 'index' 'podcast' 'website' 'YouTube' I want to store the printf output in a Results variable, how can I do this?
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How do I pass hex characters to printf in a script command? [duplicate]
How do I get printf to output hex characters when run from a script? Suppose I am at the prompt and type printf "\x41\x42" the output I get AB% However if I have a script containing that ...
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2votes
1answer
259views
Why does printing an array with @ using printf in bash only print the first element?
I have an array snapshots=(1 2 3 4) When I run printf "${snapshots[*]}\n" It prints as expected 1 2 3 4 But when I run printf "${snapshots[@]}\n" It just prints 1 without a ...
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0votes
1answer
651views
List all files in a directory, recursively, sorted by modification date
The main answer of Sort the files in the directory recursively based on last modified date gives a method to list all files in a directory, recursively, sorted by modification date: find -printf "...
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1vote
1answer
26views
How to preserve updating output in pipe, e.g. when output has `\r`
Whenever I pipe some output that is updating (say with \r), e.g. to a pager (less), or to colourise parts of it, the pipe seems to drop the lines that are updating. Any idea how to preserve the ...
- 162
2votes
1answer
165views
Print Variable containing backslashes
I have something like this: A=$(curl https://mysite.com) and the curl request returns the string \"Hello World\". When I now want to print A to the console using one of: echo "$A" ...
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