The exec() family of functions replaces the current process image with a new process image, retaining the pid and pipes of the old process.

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4
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0answers
44 views

Is it possible to make an exec call that “returns”?

Is there a way to make the exec system call work like a function call that returns instead of totally replacing the current process image? My motivation is trying to integrate two shells with ...
3
votes
2answers
57 views

Is it possible to exec some commands in a subshell without immediately exiting afterwards?

I use the fish shell and would like to be able to "source" some shell scripts written with sh-compatible syntax, which fish cannot read. For example lots of software expects you to source some shell ...
0
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0answers
54 views

SMB/CIFS mount not working with exec() call

To mount CIFS presently I use system() call in source, this works. If I try to run command manually on shell it works too. $ mount -t cifs //IP/dir /mnt -o user=name,pass=PASS,domain=mydomain,nounix ...
1
vote
1answer
28 views

find with -exec eval of $0 [duplicate]

In the following command I would like to know why $0 was evaluated to the file found by find and not the echo command. $ find . -type f -perm -u=x -exec bash -c ' /bin/echo $0 is the name of the ...
1
vote
1answer
26 views

Reading ELF file after dropping caches

I have an eMMC backed Linux 3.10 development device (Android) and I am trying to better understand when Linux is actually reading from the eMMC as opposed to the page cache. Specifically, I am ...
2
votes
1answer
52 views

How to I prevent exec from keeping the script running?

I'm using exec like this: #!/bin/bash exec > >(tee /tmp/mylog.log) 2>&1 bash -c 'sleep 12312' & I want the output of the commands to be in a log file, and then I want to start a ...
1
vote
3answers
58 views

How do I create a copy of a file in multiple directories?

I have a folder structure conf/ widget1/ env1.cfg env2.cfg widget2/ env1.cfg env2.cfg widget3/ env1.cfg env2.cfg widget4/ ...
3
votes
2answers
195 views

The «sh» being launched with execl() becomes a zombie

I am spent whole half a day, but still couldn't figure, why is the dash being launched with execl call just becomes a zombie. Below is a minimal test case — I'm just fork a child, make a duplicate of ...
0
votes
3answers
43 views

What is meaning of {} + in the exec command?

I want to know the meaning of {} + in the exec command, and what is the difference between {} + and {} \;. To be exact, what is the difference between these two: find . -type f -exec chmod 775 {} + ...
1
vote
1answer
48 views

Find only in directories n levels deep

I use this command to find and run all istances of wp-cron.php I have for each site I have: find /var/www/ -name 'wp-cron.php' -exec php -q "{}" \; Since my websites tree is: ...
-1
votes
1answer
64 views

what is the difference between exec and dbus-launch?

If I start a process, particularly at session start, what is the difference between using exec p and dbus-launch p?
2
votes
1answer
49 views

Push onto array with find exec

I want to iterate over all the files found by find and add each one to an array. Here's what I have so far: myarray=() find . -name '*.php' -exec myarray\+=\({}\) \; echo "${myarray[@]}" Instead, ...
3
votes
3answers
512 views

Why do we have to pass the file name twice in exec functions?

I read Advanced Programming in the UNIX Environment by Stevens, 8th chapter. I read and understand all the six of exec functions. One thing I notice is, in all the exec functions: first argument is ...
0
votes
1answer
76 views

Redirect all bash script output (from inside the script) to two files: one append, one rewrite; but discard output to the console

I can easily redirect both standard and error output of a bash script to the file, while discarding an output to console with simple exec statement: exec &>>/var/log/backup.log But how do ...
9
votes
4answers
965 views

How do fork and exec work?

I don't have much experience, just trying to get involved into the processes how do they interpret to hardware from user level. So when a command is fired from a shell, fork() inherits a child ...
1
vote
4answers
865 views

Bash rename 360 000 files using find -exec

I've got around 360 000 files like: ./001/1/1.jpg ./001/1/2.jpg ./001/2/1.jpg ./002/1/1.jpg ./003/1/1.jpg ... pattern: [60 dirs]/[1000 subdirs]/[4-10 files].jpg I want to rename files using rename ...
-1
votes
3answers
100 views

How to print the base file name using find in Unix?

I have been trying to print out the base file names using find in Unix. To simply print out the file names the command I have been using is this find . -type f -name \*.out -print It prints out ...
2
votes
1answer
357 views

GDB cannot exec my test program

My computer run with Ubuntu 14.04. GDB seems to be abnormal in different account. For example I make a very simple test. I write a file under ~/test/test.c like this: #include <stdio.h> ...
4
votes
2answers
700 views

How does exec bash builtin work internally?

From this link I get the following about exec bash builtin command: If command is supplied, it replaces the shell without creating a new process. How does it exactly replace the shell (i.e. ...
1
vote
1answer
73 views

exec -t is invalid

I made an rpm that installs a .run file and whenever I run the rpm and the rpm tries to execute the .run file I keep getting the error that exec -t is an invalid option at the following lines of code ...
1
vote
2answers
66 views

If I use one of the exec family functions to open a child process, will pipes to parent be applied to the child?

Say I open a parent process with a master process that assigns the stdout to a file for logging. Then say I use the parent process to open a child with execvp (or any other of the exec family of ...
0
votes
3answers
428 views

Is reparenting from the shell possible?

This question is closely related to How to "correctly" start an application from a shell but tries to tackle a more specific problem. How can I spawn an application from a shell and thereby ...
10
votes
1answer
543 views

How to “correctly” start an application from a shell

I find it hard to phrase the question precisely but I will give my best. I use dwm as my default window manager and dmenu as my application launcher. I hardly use GUI applications aside from my ...
3
votes
1answer
1k views

How does bash execute an ELF file?

When I'm on my Linux Box I use bash as a shell. Now I wondered how bash handles the execution of an ELF file, that is when I type ./program and program is an ELF file. I grepped the bash-4.3.tar.gz, ...
2
votes
1answer
769 views

Why does chroot get ENOENT on an existing file?

;TL-DR - Answer: because the dynamic linker ld-linux-x86-64.so.2 was missing. I have mounted a squashfs (shouldn't matter) filesystem -ro,loop at /mnt/foo. It contains among other things the ...
2
votes
2answers
2k views

Using exec and tee to redirect logs to stdout and a log file in the same time [duplicate]

In a bash script, how can I redirect all standard outputs to a log file and tee the output on the screen using exec ? log_file="$HOME/logs/install.txt-`date +'%Y-%m-%d_%H-%M-%S'`" [ -f "$log_file" ] ...
3
votes
1answer
41 views

How to execute as the logged-in user in a sudo script (OSX)?

Is there a way to switch contexts like that? The script in my specific case is an installer postinstall script, which requires sudo privileges only for some of the tasks and requires the logged-in ...
1
vote
0answers
39 views

Programmatically obtain LILYPOND_DATADIR for execlp() call

I wrote an application that calls lilypond by execlp()ing it. However, when my app executes this line, the following error occurs: GNU LilyPond 2.16.2 warning: not relocating, no 2.16.2/ or current/ ...
3
votes
3answers
5k views

Why use “nohup &” rather than “exec &”

I know that, nohup being a binary, it can be reached from any shell. But the exec built-in probably exists in every shell. Is there a reason to prefer one of them, to the other?
1
vote
0answers
29 views

-exec isn't being passed all the files found by find [duplicate]

There are two files called install.log and install.sh The find command will find both of these and pass them to -exec ls With the addition of an or (-o), it only passes one argument to -exec ls ...
2
votes
0answers
175 views

PHP exec and amixer

I'm trying to make php lower the dB level of amixer using exec, but it seems like php isn't able to perform the task which requires sudo-access. What should be the best way to solve this? I tried: ...
4
votes
2answers
75 views

What's the recommended way to run a service as a non-root user?

I have a simple init.d script which starts and stops a process. I call the init.d as root, but I'd like the process it controls to run as a specific user. The most common suggestion online seems to ...
5
votes
1answer
1k views

What does exec 3<&1 do?

I understand exec can do I/O Redirection on current shell level. but I only sees usage like exec 6<&0 # Link file descriptor #6 with stdin. # Saves stdin. exec 6>&1 # ...
3
votes
4answers
324 views

find -exec exit 1 \; Doesn't work neither does find -exec sh -c exit 1 \;

Using Enterprise Linux 5/6, Bash 4.x I want this type of logic: # IF temp file exists, exit because we are restarting already find /tmp/restarting_server -mmin -10 -exec exit 1 lsof -i TCP:1234 ...
0
votes
3answers
290 views

Bash in php exec in webpage don't colors for png and mp3 files on Linux

I have code like this in php: header("Content-Type: text/plain"); exec("/bin/bash -c 'ls --color=always'", $result); echo implode("\n", $result); and I've got result (escape is not visible) ...
0
votes
0answers
164 views

Gnuplot and process-substitution

I have a log file where I need to cut out two values at different positions. these are: time and dQ in my file. The main problem is the paste I think. cause the other utilities work pretty well on ...
3
votes
4answers
16k views

php shell_exec() permission on Linux Ubuntu

I'm developing a php application using Linux server. My problem is executing shell_exec() to call some exe file is not work(actually not exe, it's kind of linux executable file) echo ...
0
votes
1answer
267 views

Order a list of files, by date modified, then unzip them in that order

I have a list of zip files, that must be extracted by date modified, they contain updated images and the strange way the local mls provides them means that newer zip files container newer versions of ...
1
vote
4answers
185 views

All subprocesses are Bash (!),

I was trying to use GDB, and found that whenever it attempted to spawn the program I was debugging, Bash was spawned instead (GDB would say starting myProg..., and then Bash would appear. When I ...
1
vote
1answer
713 views

find and exec: why does this command not work?

I don't get why echo prints empty line (latest cygwin version): ~/tmp >find mydor/ -name "*php" mydor/es/c/packags.php mydor/etns/inx.php mydor/pacepors.php mydor/XAE.php ~/tmp >find mydor/ ...
0
votes
1answer
651 views

How does -exec actually work

I am confused on the -exec command. E.g. in this case: find . -type f -name "*.c" -exec cat {} \;>all_c_files.txt It seems that I get cat file1 file2 file3 ... fileN While in this case: ...
1
vote
2answers
1k views

PHP exec command has the result 0 even if an error occurs

I have this PHP code: $execout=exec('ssh root@xxx.xxx.xxx.xx "sudo /etc/init.d/smokeping reload"',$output1,$result); if($result !=0){ echo"that can't reload"; } else{ echo "successfully ...
0
votes
1answer
128 views

How to prevent find -execdir from following symlinks?

Say I have a symlink: linktob -> b If I run something like find . -type l -execdir chmod 777 {} \;, the chmod command affects the file the symlink is pointing to, i.e. ‘b’. The man page suggests ...
2
votes
1answer
122 views

exec cp failes from script, yet works when issued directly

I have a script that copies SQL backups to a windows server. Here's the line from /etc/fstab: //my.win.box/share$ /winshare cifs ...
3
votes
3answers
2k views

What after exec() in ls command. Is the parent process printing the output to the console or the child?

I have a simple doubt on execution of the command ls. As per my understanding from the research I have done on the internet, I understood the below points. When we type ls command shell interprets ...
4
votes
3answers
4k views

Copy stdout and stderr to a log file and leave them on the console within the script itself

Using bash, how do I copy stderr and stdout to a log file and also leave them displayed on the console? I would like to do this within the script itself using an exec. I tried with exec ...
0
votes
1answer
596 views

Switching to another shell without copying environment variables

From tcsh, if I try: exec /home/path/to/my/zsh it works (I enter a Zsh shell) but if I try exec -c /home/path/to/my/zsh I get: -c Command not found How do I switch to my Zsh shell and start ...
0
votes
1answer
1k views

Rename files and directories with a special characters on solaris machines

The target of the following code ( commands ) is to rename files/directories and also support files/directories with a special characters as "@" or "." etc those commands are run fine on Linux ...
2
votes
3answers
1k views

`solaris + xargs command for solaris

the command find /tmp -name 'core*' -type f -print0 | xargs -0 works fine on Linux, but xargs -0 option is not legal on Solaris what is the equivalent option ( xargs? ) for Solaris 10 second ...
7
votes
4answers
2k views

redirect and log script output

I am trying to tidy up the following snippets, design goals are to log all output from a script, and should not be a wrapper. Less lines are better. I don't care about user inputs (at this stage), ...