bash script debug output + and ++
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What are / is the significance of + and ++ at the beginning of bash debug (set -x) output?
The original text looks like this
++ delete
+ exitstatus=0
+ '[' 0 = 0 ']'
++ delete
+ whiptail --title 'Command output 1311' --separate-output --scrolltext --msgbox '/usr/bin/raspi-config-DEBUG.sh: line 1311: delete: command not found' 17 80 10
+ echo '1317 done printing choice to stdout'
shell-script
edited Sep 13 at 15:13
Kusalananda
107k14209331
asked Sep 13 at 15:09
Jan Hus
1446
add a comment |Â
up vote
0
down vote
favorite
What are / is the significance of + and ++ at the beginning of bash debug (set -x) output?
The original text looks like this
++ delete
+ exitstatus=0
+ '[' 0 = 0 ']'
++ delete
+ whiptail --title 'Command output 1311' --separate-output --scrolltext --msgbox '/usr/bin/raspi-config-DEBUG.sh: line 1311: delete: command not found' 17 80 10
+ echo '1317 done printing choice to stdout'
shell-script
edited Sep 13 at 15:13
Kusalananda
107k14209331
asked Sep 13 at 15:09
Jan Hus
1446
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
What are / is the significance of + and ++ at the beginning of bash debug (set -x) output?
The original text looks like this
++ delete
+ exitstatus=0
+ '[' 0 = 0 ']'
++ delete
+ whiptail --title 'Command output 1311' --separate-output --scrolltext --msgbox '/usr/bin/raspi-config-DEBUG.sh: line 1311: delete: command not found' 17 80 10
+ echo '1317 done printing choice to stdout'
shell-script
edited Sep 13 at 15:13
Kusalananda
107k14209331
asked Sep 13 at 15:09
Jan Hus
1446
What are / is the significance of + and ++ at the beginning of bash debug (set -x) output?
The original text looks like this
++ delete
+ exitstatus=0
+ '[' 0 = 0 ']'
++ delete
+ whiptail --title 'Command output 1311' --separate-output --scrolltext --msgbox '/usr/bin/raspi-config-DEBUG.sh: line 1311: delete: command not found' 17 80 10
+ echo '1317 done printing choice to stdout'
shell-script
shell-script
edited Sep 13 at 15:13
Kusalananda
107k14209331
asked Sep 13 at 15:09
Jan Hus
1446
edited Sep 13 at 15:13
Kusalananda
107k14209331
asked Sep 13 at 15:09
Jan Hus
1446
edited Sep 13 at 15:13
Kusalananda
107k14209331
edited Sep 13 at 15:13
Kusalananda
107k14209331
edited Sep 13 at 15:13
Kusalananda
107k14209331
107k14209331
asked Sep 13 at 15:09
Jan Hus
1446
asked Sep 13 at 15:09
Jan Hus
1446
asked Sep 13 at 15:09
Jan Hus
1446
1446
add a comment |Â
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
6
down vote
accepted
The + is the PS4 prompt (just like PS1 usually holds $ or some variation thereof, which is the default interactive prompt). It is outputted before each command executed when tracing is enabled with set -x.
The bash manual says this:
PS4
The value of this parameter is expanded as with
PS1and the
value is printed before each command bash displays during an
execution trace. The first character ofPS4is replicated
multiple times, as necessary, to indicate multiple levels of
indirection. The default is+.
The multiple + that you may see are due to commands being executed in subshells.
Example showing three levels of subshells:
$ cat script.sh
#!/bin/bash
echo "$( echo "$( echo hi )" )"
$ bash -x script.sh
+++ echo hi
++ echo hi
+ echo hi
hi
answered Sep 13 at 15:16
Kusalananda
107k14209331
Great, now for the formatting part - how was it reformatted to look as original text, for future references.
– Jan Hus
Sep 13 at 15:35
1
@JanHus You can't reformat it to get the original shell script back. In my example, there is no information that tells me exactly what the original commands looked like.
– Kusalananda
Sep 13 at 15:39
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
6
down vote
accepted
The + is the PS4 prompt (just like PS1 usually holds $ or some variation thereof, which is the default interactive prompt). It is outputted before each command executed when tracing is enabled with set -x.
The bash manual says this:
PS4
The value of this parameter is expanded as with
PS1and the
value is printed before each command bash displays during an
execution trace. The first character ofPS4is replicated
multiple times, as necessary, to indicate multiple levels of
indirection. The default is+.
The multiple + that you may see are due to commands being executed in subshells.
Example showing three levels of subshells:
$ cat script.sh
#!/bin/bash
echo "$( echo "$( echo hi )" )"
$ bash -x script.sh
+++ echo hi
++ echo hi
+ echo hi
hi
answered Sep 13 at 15:16
Kusalananda
107k14209331
Great, now for the formatting part - how was it reformatted to look as original text, for future references.
– Jan Hus
Sep 13 at 15:35
1
@JanHus You can't reformat it to get the original shell script back. In my example, there is no information that tells me exactly what the original commands looked like.
– Kusalananda
Sep 13 at 15:39
add a comment |Â
up vote
6
down vote
accepted
The + is the PS4 prompt (just like PS1 usually holds $ or some variation thereof, which is the default interactive prompt). It is outputted before each command executed when tracing is enabled with set -x.
The bash manual says this:
PS4
The value of this parameter is expanded as with
PS1and the
value is printed before each command bash displays during an
execution trace. The first character ofPS4is replicated
multiple times, as necessary, to indicate multiple levels of
indirection. The default is+.
The multiple + that you may see are due to commands being executed in subshells.
Example showing three levels of subshells:
$ cat script.sh
#!/bin/bash
echo "$( echo "$( echo hi )" )"
$ bash -x script.sh
+++ echo hi
++ echo hi
+ echo hi
hi
answered Sep 13 at 15:16
Kusalananda
107k14209331
Great, now for the formatting part - how was it reformatted to look as original text, for future references.
– Jan Hus
Sep 13 at 15:35
1
@JanHus You can't reformat it to get the original shell script back. In my example, there is no information that tells me exactly what the original commands looked like.
– Kusalananda
Sep 13 at 15:39
add a comment |Â
up vote
6
down vote
accepted
up vote
6
down vote
accepted
The + is the PS4 prompt (just like PS1 usually holds $ or some variation thereof, which is the default interactive prompt). It is outputted before each command executed when tracing is enabled with set -x.
The bash manual says this:
PS4
The value of this parameter is expanded as with
PS1and the
value is printed before each command bash displays during an
execution trace. The first character ofPS4is replicated
multiple times, as necessary, to indicate multiple levels of
indirection. The default is+.
The multiple + that you may see are due to commands being executed in subshells.
Example showing three levels of subshells:
$ cat script.sh
#!/bin/bash
echo "$( echo "$( echo hi )" )"
$ bash -x script.sh
+++ echo hi
++ echo hi
+ echo hi
hi
answered Sep 13 at 15:16
Kusalananda
107k14209331
The + is the PS4 prompt (just like PS1 usually holds $ or some variation thereof, which is the default interactive prompt). It is outputted before each command executed when tracing is enabled with set -x.
The bash manual says this:
PS4
The value of this parameter is expanded as with
PS1and the
value is printed before each command bash displays during an
execution trace. The first character ofPS4is replicated
multiple times, as necessary, to indicate multiple levels of
indirection. The default is+.
The multiple + that you may see are due to commands being executed in subshells.
Example showing three levels of subshells:
$ cat script.sh
#!/bin/bash
echo "$( echo "$( echo hi )" )"
$ bash -x script.sh
+++ echo hi
++ echo hi
+ echo hi
hi
answered Sep 13 at 15:16
Kusalananda
107k14209331
edited Sep 13 at 15:32
answered Sep 13 at 15:16
Kusalananda
107k14209331
answered Sep 13 at 15:16
Kusalananda
107k14209331
answered Sep 13 at 15:16
Kusalananda
107k14209331
107k14209331
Great, now for the formatting part - how was it reformatted to look as original text, for future references.
– Jan Hus
Sep 13 at 15:35
1
@JanHus You can't reformat it to get the original shell script back. In my example, there is no information that tells me exactly what the original commands looked like.
– Kusalananda
Sep 13 at 15:39
add a comment |Â
Great, now for the formatting part - how was it reformatted to look as original text, for future references.
– Jan Hus
Sep 13 at 15:35
1
@JanHus You can't reformat it to get the original shell script back. In my example, there is no information that tells me exactly what the original commands looked like.
– Kusalananda
Sep 13 at 15:39
Great, now for the formatting part - how was it reformatted to look as original text, for future references.
– Jan Hus
Sep 13 at 15:35
Great, now for the formatting part - how was it reformatted to look as original text, for future references.
– Jan Hus
Sep 13 at 15:35
1
1
@JanHus You can't reformat it to get the original shell script back. In my example, there is no information that tells me exactly what the original commands looked like.
– Kusalananda
Sep 13 at 15:39
@JanHus You can't reformat it to get the original shell script back. In my example, there is no information that tells me exactly what the original commands looked like.
– Kusalananda
Sep 13 at 15:39
add a comment |Â
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