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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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");
...
- 13
1
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0
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54
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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 ...
- 13
-1
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1
answer
77
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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 ...
-1
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3
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139
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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:\ ...
- 1,725
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1
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43
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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 --> ...
- 531
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2
answers
190
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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 ...
- 531
0
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0
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43
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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 ...
- 1
7
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3
answers
333
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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....
- 741
5
votes
1
answer
357
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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/...
- 584
7
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1
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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?
- 2,146
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1
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244
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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 ...
- 125
2
votes
1
answer
258
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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 ...
- 173
0
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1
answer
645
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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 "...
- 2,651
1
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1
answer
26
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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
2
votes
1
answer
165
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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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